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Poultry red mite (Dermanyssus gallinae) infestation: A broad impact parasitological disease that still remains a significant challenge for the egg-laying industry in Europe

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  • MSD Animal Health Innovtion, Schwabenheim

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The poultry red mite, Dermanyssus gallinae, has been described for decades as a threat to the egg production industry, posing serious animal health and welfare concerns, adversely affecting productivity, and impacting public health. Research activities dedicated to controlling this parasite have increased significantly. Their veterinary and human medical impact, more particularly their role as a disease vector, is better understood. Nevertheless, red mite infestation remains a serious concern, particularly in Europe, where the prevalence of red mites is expected to increase, as a result of recent hen husbandry legislation changes, increased acaricide resistance, climate warming, and the lack of a sustainable approach to control infestations. The main objective of the current work was to review the factors contributing to this growing threat and to discuss their recent development in Europe. We conclude that effective and sustainable treatment approach to control poultry red mite infestation is urgently required, included integrated pest management.
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R E V I E W Open Access
Poultry red mite (Dermanyssus gallinae)
infestation: a broad impact parasitological
disease that still remains a significant
challenge for the egg-laying industry
in Europe
Annie Sigognault Flochlay
1*
, Emmanuel Thomas
2
and Olivier Sparagano
3
Abstract: The poultry red mite, Dermanyssus gallinae, has been described for decades as a threat to the egg
production industry, posing serious animal health and welfare concerns, adversely affecting productivity, and
impacting public health. Research activities dedicated to controlling this parasite have increased significantly.
Their veterinary and human medical impact, more particularly their role as a disease vector, is better understood.
Nevertheless, red mite infestation remains a serious concern, particularly in Europe, where the prevalence of red
mites is expected to increase, as a result of recent hen husbandry legislation changes, increased acaricide resistance,
climate warming, and the lack of a sustainable approach to control infestations. The main objective of the current
work was to review the factors contributing to this growing threat and to discuss their recent development in
Europe. We conclude that effective and sustainable treatment approach to control poultry red mite infestation is
urgently required, included integrated pest management.
Keywords: Poultry red mite, Dermanyssus gallinae, Ectoparasite, Acaricide, Zoonosis, One health, Occupational
safety, Salmonella, Vector, Drug resistance
Introduction
It is well established that the poultry red mite, Derma-
nyssus gallinae (De Geer, 1778), is the most damaging
parasite of laying hens worldwide. The impact of red
mite infestation in Europe has been thoroughly
described in scientific literature, for over 20 years. Red
mite infestations pose serious animal health, welfare and
public health concerns, and affect the productivity of the
egg industry [16]. Access to effective and safe medical
treatments has been an unmet need. This review
describes the factors contributing to this omnipresent
impact and discusses their recent development in Europe.
Poultry red mite infestation poses increasing
animal health and welfare concerns
Prevalence
The first source of concerns associated with red mite in-
festation is the extremely high and increasing prevalence
of this disease in Europe. A recent epidemiological re-
view reports that 83% of the European farms are infested
by D. gallinae. This prevalence reaches 94% in The
Netherlands, Germany and Belgium [1]. Poultry red mite
infestation affects all production types, from backyard or
organic farms, to more intensive, enriched cage or barn
systems [2]. The impact of poultry red mite infestation
has been increasing in Europe for the past decades and
is expected to further increase.
One of the first factors contributing to this increase is
the recent transformation of housing systems in laying
hen husbandry in EU member countries. Directive 1999/
74/EC on egg production and egg trade has banned the
use of traditional cages for poultry birds since 2012.
* Correspondence: annie.flochlay-sigognault@merck.com
1
Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940, USA
Full list of author information is available at the end of the article
© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and
reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to
the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver
(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Sigognault Flochlay et al. Parasites & Vectors (2017) 10:357
DOI 10.1186/s13071-017-2292-4
Content courtesy of Springer Nature, terms of use apply. Rights reserved.
Although designed to improve the welfare of laying
hens, this legislation has resulted in the move to housing
systems incorporating more complex environments
which appear to favor mite proliferation and exacerbate
the problem of red mite infestation [710]. For instance,
enriched cages give far more hiding places for red mites
to escape effective treatments. Mite infestation rates
have been described to be much lower in hens kept in
traditional cage systems compared to alternative ones
[10, 11]. In 2009, before the first banning of conven-
tional cages (Austria and Germany prohibited such cages
from 2010 onwards), 74.4% of the laying hen housing
systems still consisted in conventional cages in the Euro-
pean Union. In 2013, all member states had been able to
complete the transformation process from conventional
cages to mainly enriched cages, barn systems, and free
range housing systems [12], meaning that within four
years after 2009, the high majority of laying hens was
transferred from a system unfavorable to mite prolifera-
tion to a system favoring it.
Another environmental factor expected to favor the
proliferation of red mite infestation in the future is
climate warming. During extreme weather events, red
mite increased populations have been implicated in the
deaths of large numbers of hens during the summer heat
wave of 2003 [13].
Finally, the removal of several acaricide products from
national markets due of safety concerns and the
sustained lack of new effective control methods may
have aggravated the D. gallinae prevalence in Europe.
This factor is further described later in this review.
Clinical effects of mite infestation
In addition to the high prevalence of the disease, another
concern is the severity of the effects induced by D. galli-
nae parasitism on the birdshealth and welfare. The first
clinical sign observed in infested animals is sub-acute
anemia due to repeated mite bites. A laying hen can lose
more than 3% of its blood volume every night [3]. In
extreme cases, D. gallinae infestation burdens may be so
heavy that hens may die from severe anemia [1416].
Two reports, detailing the effects of heavy mite infesta-
tions in layer farms in Poland and Romania, describe a
6.2% and a 10-fold increase in hen mortality due to red
mite infestations [14, 15].
Disease vector role of D. gallinae
Besides this direct effect of hematophagous parasitism,
D. gallinae has also been implicated as a vector for a
number of avian viral and bacterial pathogens of animals
and humans. These include the paramyxovirus that causes
Newcastle disease, the Eastern, Western, and Venezuelan
equine encephalomyelitis viruses, and bacteria such as
Escherichia coli,Erysipelothrix rhusiopathiae,Pasteurella
multocida,Salmonella gallinarum and S. enteritidis and
avianinfluenzaAvirus[5,6,1722].
Poultry mites often serve as a long-term host of viral
and bacterial pathogens, thus becoming a reservoir for
these agents and exacerbating the vector potential of D.
gallinae. For example, eastern equine encephalomyelitis
virus and P. multocida were isolated from mites 30 days
and two months, respectively, after ingestion of blood
meals from infected chickens [21]. The ability of the
mite to survive between successive flocks and its persist-
ence in a fasting state for extended periods of time en-
hance its vectorial role in maintaining pathogen agents
on poultry farms [23].
Impact of mite infestation on birds welfare
First, the presence of mites in a production house in-
duces a high level of stress in the birds. Stress is induced
by pain and skin irritation associated with repeated mite
bites favored by the very high parasite load typical of red
mite infestations, with mite densities ranging from
25,000 to 500,000 mites per hen [1, 3, 24]. In addition,
mite infestations induce aggressive feather-pecking and
cannibalistic behavior, increased feed and water intake,
and decrease general animal health [3, 4, 25, 26]. Higher
noise volumes are typically observed by farmers in mite
infested houses. Increased self-grooming, a characteristic
symptom of anxiety, is observed in artificially infested
hens [24]. The severity of injuries resulting from such
behavior is currently limited by beak-trimming, but is
expected to increase following the scheduled ban on
beak trimming across several European member states
in 2016 [1]. Kowalski & Sokol [27] showed that mite in-
festation led to a 1.5-fold increase in corticosterone
blood levels and a 22% decrease in β-globulin levels,
indicating somatic stress and immunosuppression. The
adrenaline levels were also more than twice as high as in
the control animals, indicating psychogenic stress. For
all these reasons, poultry red mites infestation is widely
recognized as an animal welfare issue by the scientific
community [7], and was a major topic at the June 2009
European Symposium on Poultry Welfare [28].
Growing impact of red mite infestation on public
health
In addition to its effects on chickens health and welfare,
red mite infestation also poses public health concerns,
due to the role of D. gallinae as a disease vector of
zoonotic diseases, and its medical impact on humans
living or working in close association with poultry.
Role of D. gallinae in transmission of zoonotic diseases
As described above, D. gallinae is involved in the
transmission of numerous poultry pathogens, includ-
ing zoonotic pathogens like Salmonella enteritidis
Sigognault Flochlay et al. Parasites & Vectors (2017) 10:357 Page 2 of 6
Content courtesy of Springer Nature, terms of use apply. Rights reserved.
[1719, 26], which is responsible for one of the most
widespread zoonoses worldwide, non-typhoidal sal-
monellosis. This disease has the highest global human
mortality rate of any zoonotic disease, with most
cases being of food-borne origin, and poultry prod-
ucts being one of the most common sources of the
disease [18, 20]. Mites become carriers of Salmonella
either by external cuticular contact or ingestion of a
bloodmealfrominfectedbirds[19].Salmonella has
been found to survive internally in D. gallinae for up to
four months [21], with bacterial reproduction occurring
within the mites [19]. D. gallinae may transmit Salmonella
to poultry when birds orally ingest infected mites [17, 19].
Borrelia burgdorferi, the causative agent of Lyme
disease, and avian influenza A virus, mentioned above as
part of the avian pathogens, have been recently added to
the list of zoonotic pathogens potentially transmitted by
D. gallinae [6, 22].
Medical impact of red mite infestation
Red mites are of growing concern in human medicine.
D. gallinae infestation is increasingly responsible for
human dermatological lesions, namely gamasoidosis,
particularly in people living or working in close proxim-
ity to poultry [5]. A recent survey reported an increasing
incidence of gamasoidosis worldwide, and that the dis-
ease is underdiagnosed [6]. The survey showed that the
severity of the disease is exacerbated by the persistency
of the infestation, the frequent treatment failures, and,
as described above, the potential transmission of zoo-
noticdiseasesbythemites,suchasBorrelia burgdor-
feri,Babesia and Bartonella.Completeprevalencedata
on gamasoidosis in poultry workers are not available.
However, the 19% incidence of contact dermatitis re-
ported in a two-year survey of workers on 58 European
poultry farms is probably a reasonable indication of
occupational risk [29]. Many gamasoidosis cases are
misdiagnosed or go unreported [30], suggesting that
actual incidence is higher than commonly assumed.
Poultry red mite infestation is therefore definitely a
matter for the One Healthinitiative [31], an ap-
proach that considers both veterinary and human
health implications of mite infestation which is one of
the central working areas the European Cooperation
in Science and Technology (COST) conference for
sustainable Control of the poultry Red Mite (COR-
EMI, http://www.coremi.eu/home.html) [32]. In 2011,
a group of European researchers in this field claimed
that they wholeheartedly support the inclusion of the
red mite as a zoonotic agent in all regulations regard-
ing occupational safety, and poultry red mite infest-
ation as an occupational hazard for individuals
working with poultry[29].
Productivity losses due to red mite infestation
have significantly increased
Economic losses from poultry mite infestation severely
affect the productivity of the egg industry. Consequences
of red mite infestation in a layer operation include pri-
marily a negative impact on feed conversion ratio, a drop
in egg production, an increase in downgraded eggs, a
higher susceptibility to poultry diseases, and more dead
animals [1]. A still widely quoted estimate for the cost of
mite control and production losses is 130 million
annually [3]. Because this commonly used number was
calculated in 2005, it underestimates the cost of red mite
infestation in Europe at the present time. First, the
laying hens population, estimated at 350 million heads
in 2005 [3], has increased significantly. In 20132014,
the Statistics Division of the Food and Agricultural
Organization of the United Nations has estimated the
number of layer chickens in the 17 largest egg-
producing countries in Europe to be 431 million [33].
Second, the high infestation rate in European farms has
become an increasingly important concern. Several
European countries have recently reported prevalence
rates of more than 90% [1], versus 80% for the most
affected countries about a decade ago [3, 8].
Van Emous (2005) [3] estimated the impact of mite in-
festations on productivity to be 43/hen, including 0.14
for mite treatment (direct costs), and 0.29 for product-
ivity losses (indirect costs). The estimation of the evolu-
tion of direct treatment costs is complex due to the
changes in the acaricidal treatments arsenal available to
farmers in the past decades, as described later in this re-
view. Recently, in 2017, the same author [34] estimated
that the current total cost of red mite infestation is
0.60 per hen per year in the Netherlands (0.15 for
direct costs, and 0.45 for productivity losses), which
represents an increase of about 40% compared to 2005
for the total cost of mite control per layer head. Overall,
the damage caused by mites in Europe is now estimated
at about 231 million [34]. Van Emous explains this
higher damage by the conversion of traditional cages
to alternative housing systems, the longer production
life-cycles of the animals, and the ban of beak trim-
ming [34].
Control of mite infestations remains a major
unmet medical need
The increased need for a sustainable approach to control
poultry mite infestation has been thoroughly described.
A very limited number of chemical treatments are cur-
rently available to treat mite infestations [2, 35]. Many
conventional mite products have been withdrawn from
European markets or banned in the past few years
because they did not comply with European or national
regulatory requirements for human consumer and user
Sigognault Flochlay et al. Parasites & Vectors (2017) 10:357 Page 3 of 6
Content courtesy of Springer Nature, terms of use apply. Rights reserved.
safety. The main product classes affected were carba-
mates (carbaryl, methomyl, propoxur), organophos-
phates (dichlorvos, fenitrothion, chlorpyrifos, diazinon),
and pyrethroids (cyhalothrin). At the time of writing, the
organophosphate phoxim (Byemite®, Bayer [36]) is the
only veterinary medicinal product registered in Europe
for the treatment of D. gallinae infestations (since 2010).
However, it is not licensed in countries with the largest
layer industries like Germany, Poland, Spain and the
UK, where the prevalence of D. gallinae infestations
exceeds 80% [1, 3, 8]. Although this spray treatment is
allowed for application in the presence of birds in the
infested house, it should not be sprayed onto the birds.
This required precaution of use may prevent the active
compound to reach mites hidden in the refuges located
very close to the birds. Furthermore, an egg withdrawal
period of twelve hours has to be observed after treat-
ment, which makes this product unsuitable for use in
large caged layer farms. Finally, the use of organophos-
phates as a solution to control mite infestation is limited
by the widespread resistance of D. gallinae to this class
of acaricide [35, 37].
Besides phoxim, several acaricidal spray products are
available in some European countries, mainly for use
during the unoccupied cleaning period between two
flocks, for the treatment of the poultry house and equip-
ment. For example, pyrethroids (cypermethrin, permeth-
rin, deltamethrin), carbamates (bendiocarb), abamectin
and spinosad are available as formulations for spray ap-
plication. Some of these products have no recommended
egg withdrawal time, which poses a serious human food
safety risk if used off label, in the presence of birds. Only
a few compounds,e.g. spinosad (Elector®) and cyperme-
thrin (Intermitox®) in Germany, can be applied in the
presence of birds. Misuse or even illegal use of acaricidal
compounds (e.g. amitraz, fipronil, ivermectin, diazinon,
carbaryl, and other pesticides used in agriculture) for the
treatment of D. gallinae in poultry houses are suspicious
of common use in certain areas. This poses critical risks
to consumer safety, but is also a reason for resistance
development as a result of underdosing [3841]. A
recent survey in Poland revealed that 50% of the 32 en-
rolled laying farms use products with unknown ingredi-
entsto treat D. gallinae infestation [37].
Successful chemical treatment is also hampered by
resistance development to multiple acaricides [4, 42] due
to creation of resistant mites as a result of improper
treatment application [35, 36]. Uneven spraying, espe-
cially inside crevices and cracks or litter (Fig. 1) may
lead to exposure of mites to sublethal concentrations.
Additionally, currently marketed acaricidal products
have only short residual activity [43], which is a problem
when targeting D. gallinae mites that may not encounter
treated surfaces until several days after application.
Furthermore, these products are applied only once, and
are either not substantially active or inactive on mite eggs,
so eggs develop into further stages, enabling regrowth of
mite infestation burdens in the poultry houses.
Some non-chemical methods of control are used, but
none has a satisfactory risk-benefit balance. Although
silica-based products are widely used, their purity and
the size of their particles vary greatly between products,
and they pose serious safety threats for user and animal
due to the irritation of the respiratory tract caused by in-
haled silica particles, which justified the recent ban of
these products in the Netherlands. Natural acaricides,
including essential oils or plant-derivatives may have
variable concentrations as active ingredients and may be
harmful to humans and animals [26]. Predator mites
have not shown satisfactory efficacy so far [2]. The
development of new vaccine-based control strategies is a
promising approach; a vaccine under development
reduced mite counts in infested birds, but not to an ad-
equate extent [44, 45]. Heating of the house up to 60 °C
Fig. 1 Environmental infestation with poultry red mites. aRed mite cluster on the ceiling of a cage at a laying farm. bRed mites and mite eggs
hidden in straw litter from a laying-hen building. High infestation densities make it difficult to successfully control Dermanyssus gallinae using
environmental control alone
Sigognault Flochlay et al. Parasites & Vectors (2017) 10:357 Page 4 of 6
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during the unoccupied period has been described as
effective; however, this is perceived as expensive and not
suitable for farms with plastic equipment components
[26]. The use of diesel oil or washing-up liquids to treat
mite infestations has also been described [46].
Access to an effective, convenient and safe medical
treatment for red mite infestation has been an unmet
need for nearly two decades: as early as 1998, the need
for a systemic substance was expressed to avoid stressing
chickens and uneven spray distribution [4]. Since then,
only one veterinary medicinal product against poultry
mite infestation has been licensed in a few European
countries (phoxim, Byemite®, Bayer). As detailed above,
all other solutions currently available are non-chemical
products with efficacy not scientifically researched, or
chemical sprays with limited value due to their mode of
application or the widespread development of resistance.
Several unlicensed (or even banned) products are still
widely employed in Europe [2]. A recent survey showed
the presence of pesticides banned by the European
Union (carbaryl) or not licensed for use on layers
(permethrin) in the tissues of laying hens slaughtered for
human consumption [41]. This further emphasizes the
severe risks that the lack of effective and authorized
products pose to human food safety.
This unmet medical need and the urgent need for in-
novative treatment approaches have clearly been recog-
nized by the scientific community, the layer industry,
and the European Union. The absence of an effective
treatment is stated in most of the scientific papers and
has been recognized by the EU Commission, which
created and funds the COST Action FA 1404 Research
Platform (COREMI, Control of Red MItes) to rid laying
hens of a common disease-spreading pest. This four-
year project started in December 2014 and involves rep-
resentatives from almost all European countries, Turkey,
and Israel. One of the major conclusions from recent
COST conferences was that no single treatment method
is sufficient to control D. gallinae. Increased use of inte-
grated pest management, improved biosecurity measures
to prevent transmission of mites, and mite infestation
monitoring are considered the best current methods to
control D. gallinae infestation. There remains a great
demand for developing more useful, effective and in-
novative treatments to keep red mite infestations under
control, including newer generation acaricides [35].
Conclusion
Since the last reviews on the impact of D. gallinae in
Europe, research activities dedicated to controlling this
parasite has increased significantly. However, poultry red
mites remain a significant animal welfare concern and a
serious threat to the egg production industry. Their vet-
erinary and human medical impact, more particularly
their role as a bacterial and disease vector, is better
understood. The significance of poultry red mites in
Europe is expected to increase as a result of recent hen
husbandry welfare legislation, increased acaricide resist-
ance, and the lack of a sustainable approach to control in-
festations. Work is urgently required to develop effective
and sustainable treatment approach to control poultry
mite infestation, included integrated pest management.
Abbreviations
COREMI: Control of the poultry red mite; COST: European Cooperation in
Science and Technology; FAO: Food and Agriculture Organization
Acknowledgements
The authors would like to thank Melissa Peng for her assistance in preparing
the manuscript.
Funding
Not applicable.
Availability of data and materials
Not applicable.
Ethics approval and consent to participate
Not applicable.
Authorscontributions
AFS analyzed the review data, and was a major contributor in writing the
review. ET analyzed the review data, and was a major contributor in writing
the review. OS was a major contributor in writing the review. All authors
read and approved the final manuscript.
Consent for publication
Not applicable.
Competing interests
AFS is an employee of Merck Animal Health, Madison, NJ, USA. ET is an
employee of MSD Animal Health, Schwabenheim, Germany. OS declares that
he has no competing interests.
Author details
1
Merck Animal Health, 2 Giralda Farms, Madison, NJ 07940, USA.
2
MSD
Animal Health Innovation GmbH, Zur Propstei 55270, Schwabenheim,
Germany.
3
Coventry University, Vice-Chancellor Office, Alan Berry Building,
Coventry CV1 5FB, UK.
Received: 27 March 2017 Accepted: 13 July 2017
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Sigognault Flochlay et al. Parasites & Vectors (2017) 10:357 Page 6 of 6
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... D. gallinae se reproduce de forma muy rápida, su ciclo puede completarse en 7 o 14 días y por tanto se produce una gran población de estos en el lugar donde se encuentren (Abdel-Ghaffar et al.,2008, Pritchard et al., 2015. Debido a esto, el control de este parásito externo se realiza a través de acaricidas químicos, pero existen individuos que han desarrollado resistencia a organofosforados, piretroides, neonicotinoi-des y carbamatos (Nechita et al.,2015;Sigognault et al., 2017) . Además, estos productos sintéticos en varios países europeos han sido retirados por no cumplir con los requisitos para la seguridad de los consumidores y productores; por tanto, el control efectivo de D. gallinae sigue siendo una necesidad (Sigognault et al.,2017). ...
... Debido a esto, el control de este parásito externo se realiza a través de acaricidas químicos, pero existen individuos que han desarrollado resistencia a organofosforados, piretroides, neonicotinoi-des y carbamatos (Nechita et al.,2015;Sigognault et al., 2017) . Además, estos productos sintéticos en varios países europeos han sido retirados por no cumplir con los requisitos para la seguridad de los consumidores y productores; por tanto, el control efectivo de D. gallinae sigue siendo una necesidad (Sigognault et al.,2017). Mientras, como productos pesticidas efectivos en aves, de mínimo riesgo según la Ley Federal de insecticidas, fungicidas y rodenticidas [FIFRA]; además, Sparagano et al. (2016) afirma que el uso de aceite esencial de tomillo no tiene efectos negativos sobre la producción de huevo. ...
Article
Full-text available
Contextualización: el ácaro rojo de las aves de corral (Dermanyssus gallinae) es un ectopárasito que afecta la salud de las gallinas ponedoras, genera estrés en la población, disminuye la tasa de crecimiento y por ende baja la calidad de los huevos. Vacío de conocimiento: el control de D. gallinae se hace a través de acaricidas químicos hacia los cuales se han generado resistencia, es necesario nuevas alternativas a base de productos naturales, entre estos los aceites esenciales y específicamente el de tomillo (Thymus vulgaris). Propósito: el objetivo de esta investigación fue evaluar la actividad acaricida del aceite esencial de T. vulgaris contra D. gallinae de aves ponedoras en Tinjacá (Boyacá - Colombia). Metodología: el aceite esencial de T. vulgaris en concentraciones de 0.05, 0.1, 0.15, 0.20 y 0.25 mg / cm2 fue evaluado a través de bioensayos por contacto bajo condiciones de laboratorio. Resultados y conclusiones: Se obtuvo un 100% de mortalidad de D. gallinae con el aceite esencial de T. vulgaris en concentraciones de 0.05 y 0.25 mg / cm2, a los 35 minutos de contacto. La CL50 fue de 0,073 mg / cm2 y el TL50 fue de 13 minutos. El uso del aceite esencial de tomillo se puede sugerir como una alternativa para el control del ácaro rojo de las aves en las explotaciones avícolas.
... Furthermore, D. gallinae can serve as a vector of pathogens with zoonotic potential, including bacteria and viruses such as Salmonella spp., Erysipelothrix rhusiopathiae, Escherichia coli and Influenza type A virus [5][6][7]. Regarding public health, numerous human infestation cases are reported either from hospitals where pigeons sometimes build their nest, poultry house personnel, or even from swallows at apartment windows [8][9][10]. In Europe, the prevalence of PRM in poultry farms is estimated at 83%, while in northern Greece, infestation prevalence reaches 100% [10,11]. ...
... Regarding public health, numerous human infestation cases are reported either from hospitals where pigeons sometimes build their nest, poultry house personnel, or even from swallows at apartment windows [8][9][10]. In Europe, the prevalence of PRM in poultry farms is estimated at 83%, while in northern Greece, infestation prevalence reaches 100% [10,11]. Its life cycle comprises five distinct stages, with only nymphs and adults feeding on blood. ...
Article
Full-text available
Dermanyssus gallinae (PRM) is the most common blood-sucking ectoparasite in laying hens and is resistant against numerous acaricides. Silver nanoparticles (AgNPs) represent an innovative solution against PRM. The current study aimed to assess the in vitro acaricidal activity of AgNPs against PRM and describe their potential mechanism of action. Nanoparticles were produced using a wet chemistry approach. Mites were collected using AviVet traps from 18 poultry farms in Greece. Contact toxicity bioassays were carried out for 24 h with negative controls, 20, 40, 60, or 80 ppm AgNPs. Analysis of variance was used to compare the mortality rates of PRM between the control and treatment groups, while LC 50 , LC 90 , and LC 99 values were estimated using probit regression analysis for the total farms jointly and separately. Nanoparticles displayed strong acaricidal activity, and mortality rates were significantly different between groups and increased by AgNPs concentration. Overall mean LC 50 , LC 90 , and LC 99 values were 26.5, 58.8, and 112.3 ppm, respectively. Scanning electron microscopy on mites treated with 80 ppm AgNPs revealed cracks in their exoskeleton and limb detachments, presumably resulting from the interaction between AgNPs and the mites' chitin. Future studies should focus on assessing AgNPs residues in chicken tissues before moving into field trials.
... In the European Union (EU) most of the commercial egg-laying facilities are infested with D. gallinae. For example, Flochlay et al. (2017) reported, that 83% of the EU farms are infested by D. gallinae. Fiddes et al. (2005) reported an infestation rate of 62% of egg-laying hen farms for the UK and Mul (2016) reported infestation rates up to 94% for The Netherlands, Germany and Belgium. ...
Article
Four silica-based acaricides were examined in laboratory tests for their effectiveness against poultry red mite, Dermanyssus gallinae. All acaricides resulted in 100% mite mortality. Two groups of active ingredients could be differentiated. The products Silicosec® and Ewazid®, based on naturally occurring diatomaceous earth (DE), killed 100% of adult D. gallinae within 48 h exposure time. The time to kill 50% of the mites (LT50) was calculated to be 31.7 and 34.9 h, respectively. The other two products, containing aggregates and agglomerates of pyrogenic synthetic amorphous silicon dioxide as active ingredients, killed the mites in a significantly shorter time: LT50 was 6.3 h for the liquid product Fossil Shield® Instant White and 11.8 h for the powdery product Fossil Shield 90.0 White. This is more remarkable as the quantities of active ingredients used for the DE treatments were several folds higher. The effectiveness of all tested products was also shown in practical tests. A professional company treated five chicken houses on one farm in the Berlin–Brandenburg region with the test products, three houses with Fossil Shield Instant White and one each with Ewazid and Silicosec. Over a period of 46 weeks after stocking, the mite development in the houses was assessed. Only in one of the houses, treated with Fossil Shield Instant White, the mite population remained permanently low. In two houses treated with Fossil Shield Instant White, small mite colonies appeared in week 36, which were controlled by a follow-up spot treatment in week 41. In the houses treated with DE, the first mite colonies appeared 12 weeks after stocking. The number increased continuously over the experimental period and in week 31 after stocking there were clearly visible colonies (2–3 cm diameter) and the first mites could also be detected on the chicken eggs. At this time both houses were treated again with a follow-up spot-treatment, which only led to a slight improvement in one house and to a stabilization of the infestation in the other house. In week 41, large mite colonies were detected in both houses. A spot treatment at this point was ineffective in reducing the infestation. The tests showed faster acaricidal action of the products with the synthetic active ingredients compared to the natural DE-based products. This matches the shorter killing times under laboratory conditions. The experiments in a commercial chicken farm showed that it is possible to control the mite population for a period of 46 weeks by using physically effective SiO2-based products. These products are therefore an effective alternative to the use of chemical acaricides.
... humans [3,4] and can transfer zoonotic diseases such as fowl spirochaetosis, chicken pox virus, Newcastle virus, pullorum disease, fowl typhoid, and fowl cholera [5]. The reproduction rate of poultry red mites is very fast, with a pair of mites reproducing to 8 mites after 1 week, 64 after 2 weeks, 32,768 after 5 weeks, and 1 billion after 10 weeks [6]. ...
Article
Full-text available
The poultry red mite, Dermanyssus gallinae (Mesostigmata: Dermanyssidae), is a major pest that causes great damage to chicken egg production. In one of our previous studies, the management of red mites using entomopathogenic fungi was evaluated, and the acaricidal fungus Beauveria bassiana JEF-410 was selected for further research. In this study, we tried to elucidate the pathogenesis of B. bassiana JEF-410 and the defense mechanisms of red mites at a transcriptome level. Red mites collected from a chicken farm were treated with B. bassiana JEF-410. When the mortality of infected red mites reached 50%, transcriptome analyses were performed to determine the interaction between B. bassiana JEF-410 and red mites. Uninfected red mites and non-infecting fungus served as controls. In B. bassiana JEF-410, up-regulated gene expression was observed in tryptophan metabolism and secondary metabolite biosynthesis pathways. Genes related to acetyl-CoA synthesis were up-regulated in tryptophan metabolism, suggesting that energy metabolism and stress management were strongly activated. Secondary metabolites associated with fungal up-regulated DEGs were related to the production of substances toxic to insects such as beauvericin and beauveriolide, efflux pump of metabolites, energy production, and resistance to stress. In red mites, physical and immune responses that strengthen the cuticle against fungal infection were highly up-regulated. From these gene expression analyses, we identified essential factors for fungal infection and subsequent defenses of red mites. These results will serve as a strong platform for explaining the interaction between B. bassiana JEF-410 and red mites in the stage of active infection.
... The northern fowl mite (Ornithonyssus sylviarum) is a well-known cause of occupational allergies in poultry farm employees. D. gallinae is a zoonotic diseases vector that has a harmful influence on humans who live or work near poultry (Sigognault Flochlay et al. 2017). Poultry feathers, dander, serum, and fecal material all contain allergenic components and have been linked to occupational allergies in poultry workers by inhalation, ingestion, and eye contamination. ...
Article
The poultry industry is one of the most rapidly expanding and most adaptable from all livestock industries. It accounts for approximately 80% of poultry stocks in low-income food-deficit countries. Poultry farming significantly improves human health by providing high nutritive food and also generates a small income and savings, particularly for women. It contributes to increasing resilience to shocks and reduces economic vulnerability and providing manure for the vegetable garden and crop production. However, intensive egg production harms the welfare of confined laying hens, increasing the danger of epidemics. Low productivity and egg quality are caused by ectoparasitic hematophagous mites, saprophagous feather mites, and other stored product mites. Storage mites, particularly Acaridae, Glycyphagidae, and Chortoglyphidae families, are abundant in farming and occupational settings. They cause clinically significant allergies like urticaria, rhinitis, asthma, dermatitis. Workers in poultry confinement frequently get health problems as a result of occupational exposure to poultry dust. Hence, to control pests, cultural, biological and chemical tactics must be carefully integrated. Biosecurity is always a critical component in keeping disease organisms and pests from entering the business as much as possible.
... The northern fowl mite (Ornithonyssus sylviarum) is a well-known cause of occupational allergies in poultry farm employees. D. gallinae is a zoonotic diseases vector that has a harmful influence on humans who live or work near poultry (Sigognault Flochlay et al. 2017). Poultry feathers, dander, serum, and fecal material all contain allergenic components and have been linked to occupational allergies in poultry workers by inhalation, ingestion, and eye contamination. ...
Article
Full-text available
The poultry industry is one of the most rapidly expanding and most adaptable from all livestock industries. It accounts for approximately 80% of poultry stocks in low-income food-deficit countries. Poultry farming significantly improves human health by providing high nutritive food and also generates a small income and savings, particularly for women. It contributes to increasing resilience to shocks and reduces economic vulnerability and providing manure for the vegetable garden and crop production. However, intensive egg production harms the welfare of confined laying hens, increasing the danger of epidemics. Low productivity and egg quality are caused by ectoparasitic hematophagous mites, saprophagous feather mites, and other stored product mites. Storage mites, particularly Acaridae, Glycyphagidae, and Chortoglyphidae families, are abundant in farming and occupational settings. They cause clinically significant allergies like urticaria, rhinitis, asthma, dermatitis. Workers in poultry confinement frequently get health problems as a result of occupational exposure to poultry dust. Hence, to control pests, cultural, biological and chemical tactics must be carefully integrated. Biosecurity is always a critical component in keeping disease organisms and pests from entering the business as much as possible.
Preprint
Studies exploring the effect of microclimatic changes on host-parasite relationships are scarce, however, many models predict changes in the distribution and incidence of diseases associated with climate change. In this study, we increased both temperature and relative humidity in blue tit nest-boxes during the breeding season, trying to discern between the effect of both variables on the abundance of ectoparasites reported in previous studies and, also, on the body condition of the nestlings and adults. Temperature and relative humidity were experimentally increased an average of about 2ºC and 15 units respectively. The abundance of blowfly Protocalliphora azurea pupae was significantly reduced in nests with increased temperature as compared to control nests and nests with increased relative humidity, and was also significantly reduced in nests with increased relative humidity as compared to control nests. The abundance of Dermanyssus spp. mites and Ceratophyllus gallinae flea larvae was significantly reduced in nests with increased relative humidity. However, there was no significant effect of the experiment on flying insect vectors abundance (Blackflies and biting midges.). On the other hand, body condition and mass of nestlings were lower in nests with increased relative humidity and nestlings’ mass was also lower in heated nests. However, the body condition and mass of the adults was not significantly affected by the experiment. In addition, blowfly Protocalliphora azurea pupae and biting midges Culicoides spp. had a significant negative effect on body condition and mass of nestlings and adults. In conclusion, an increase in temperature, on the one hand, and relative humidity, on the other, reduces the abundance of ectoparasites, which suggests that these parasites are sensitive to sudden changes in the microclimate in which they develop. In addition, these fluctuations negatively affect the body condition and mass of blue tit nestlings despite the concurrent decrease of parasites in nests.
Article
Daily farm management practices play an essential role in determining and steering health, welfare and productivity of laying hen flocks. Optimal management requires expertise of farmers and coworkers, especially when hens are kept in complex, large-scale aviary systems. Relatively little sensor-based support is available to farmers, even though numerous research groups are working on developing technologies to continuously detect deviations in layer health and welfare. A survey with laying hen farmers, poultry veterinarians and poultry experts from Western Europe and Canada was conducted to identify and prioritize indicators of optimal and suboptimal laying hen health and welfare in commercial farms. The status-quo of sensor technology and the advantages, wishes, and concerns regarding sensors were additionally assessed to contribute to the future development of a predictive monitoring tool that continuously monitors laying hen health and welfare. A total of 45 stakeholders were interviewed, of which 41 filled in an online questionnaire. Although the prioritization of indicators differed between stakeholders, the majority identified the use of feed and water intake, egg production and quality, sound, activity, and movement of hens as important indicators to assess health and welfare. Currently collected (sensor) data were not used to their full potential, and stakeholders missed the integration and storage of data into one monitoring system with easy visualization tools. Most interest was observed in the use of cameras and microphones to detect deviations in health and welfare at an early stage, to reduce subjectivity of the assessment and to gain more knowledge on layer behavior. It can be concluded that these results could steer research efforts towards the development of continuous monitoring techniques, and enhance their adaptability and acceptability by stakeholders.
Conference Paper
Full-text available
The presentation gives an overview on the dynamics of the European egg industry between 1993 and 2013. A detailed analysis of the impacts of directive 1999/74/EC (banning of conventional cages) on the egg industry in Germany, the Netherlands and Spain documents the changes in laying hen numbers, egg production and egg trade.
Article
Full-text available
An aqueous extract of the haematophagous poultry ectoparasite, Dermanyssus gallinae, was subfractionated using anion exchange chromatography. Six of these subfractions were used to immunise hens and the blood from these hens was fed, in vitro, to poultry red mites. Mite mortality following these feeds was indicative of protective antigens in two of the subfractions, with the risks of mites dying being 3.1 and 3.7 times higher than in the control group (P <0.001). A combination of two-dimensional immunoblotting and immunoaffinity chromatography, using IgY from hens immunised with these subfractions, was used in concert with proteomic analyses to identify the strongest immunogenic proteins in each of these subfractions. Ten of the immunoreactive proteins were selected for assessment as vaccine candidates using the following criteria: intensity of immune recognition; likelihood of exposure of the antigen to the antibodies in a blood meal; proposed function and known vaccine potential of orthologous molecules. Recombinant versions of each of these 10 proteins were produced in Escherichia coli and were used to immunise hens. Subsequent in vitro feeding of mites on blood from these birds indicated that immunisation with Deg-SRP-1 (serpin), Deg-VIT-1 (vitellogenin), Deg-HGP-1 (hemelipoglycoprotein) or Deg-PUF-1 (a protein of unknown function) resulted in significantly increased risk of mite death (1.7 - 2.8 times higher than in mites fed blood from control hens immunised with adjuvant only, P <0.001). The potential for using these antigens in a recombinant vaccine is discussed. Copyright © 2015. Published by Elsevier Ltd.
Article
Full-text available
T;:il, j:$id"::#lJ,i:t*iff f ;;fr:iiil;ffi ";:':'^'' Pilarczyk B., BaIicka-Ramisz A., Ramisz A., Pająk B. lnfluence of Demanyssus gallinae on health and ploduction in layets Sumnrary Aim of the study was to estimate the influence of Dermanyssus gallinae on the health and production of layers. The study was carried out in a layer cross-breeding (HYLINE) farm of 17,650 birds. The material for investigation was collected from different areas beneath the feed-and eggs transporters. Parasite examination occurred atthe29th week of life and confirmed a massive prevalence of Dermanyssu § gallinae. Puralyl (active substance:l-Naphthalenyl-methylcarbamate) in solution was used to contro,l,,: the Dermanyssus gallinae invasion. The drug ł-as applied three times at 7-d,ay intervals. The efficacy of the ' treatment was established 10 and 20 days following drug application. The D. gallinae invasion reduced egg production by about 20.17o/o and increased the mortality rate to 6.17o^.
Article
Full-text available
The poultry red mite Dermanyssus gallinae is best known as a threat to the laying-hen industry; adversely affecting production and hen health and welfare throughout the globe, both directly and through its role as a disease vector. Nevertheless, D. gallinae is being increasingly implemented in dermatological complaints in non-avian hosts, suggesting that its significance may extend beyond poultry. The main objective of the current work was to review the potential of D. gallinae as a wider veterinary and medical threat. Results demonstrated that, as an avian mite, D. gallinae is unsurprisingly an occasional pest of pet birds. However, research also supports that these mites will feed from a range of other animals including: cats, dogs, rodents, rabbits, horses and man. We conclude that although reported cases of D. gallinae infesting mammals are relatively rare, when coupled with the reported genetic plasticity of this species and evidence of permanent infestations on non-avian hosts, potential for host-expansion may exist. The impact of, and mechanisms and risk factors for such expansion are discussed, and suggestions for further work made. Given the potential severity of any level of host-expansion in D. gallinae, we conclude that further research should be urgently conducted to confirm the full extent of the threat posed by D. gallinae to (non-avian) veterinary and medical sectors.
Article
Full-text available
For integrated pest management (IPM) programs to be maximally effective, monitoring of the growth and decline of the pest populations is essential. Here, we present the validation results of a new automated monitoring device for the poultry red mite (Dermanyssus gallinae), a serious pest in laying hen facilities world-wide. This monitoring device (called an “automated mite counter”) was validated in experimental laying hen cages with live birds and a growing population of D. gallinae. This validation study resulted in 17 data points of ‘number of mites counted’ by the automated mite counter and the ‘number of mites present’ in the experimental laying hen cages. The study demonstrated that the automated mite counter was able to track the D. gallinae population effectively. A wider evaluation showed that this automated mite counter can become a useful tool in IPM of D. gallinae in laying hen facilities. Electronic supplementary material The online version of this article (doi:10.1007/s10493-015-9923-2) contains supplementary material, which is available to authorized users.
Article
Salmonella and the poultry red mite (Dermanyssus gallinae) remain very challenging diseases for the poultry industry worldwide because of the inefficiency of implementing and integrating eradication and control programs, which results in very high economic losses to the poultry industry. The aim of this study was to determine the association between biosecurity levels in layer farms and the occurrence of both D. gallinae and Salmonella spp., as well as the relationship between D. gallinae infestations on farms and Salmonella occurrence. For this purpose, 22 layer farms using the common battery cage housing system in different parts of Kosovo were randomly selected and analyzed for the presence of D. gallinae and Salmonella in samples, such as feces, water, feed, and dust. Two pooled samples of D. gallinae (2n = 100) were directly analyzed for the presence of Salmonella in the outer and inner parts of cuticula from D. gallinae. A chi-square test was used to determine the association between experience in poultry production, rearing, and level of different biosecurity elements in relation to the occurrence of D. gallinae and Salmonella. Dermanyssus gallinae was found on 15 farms, whereas Salmonella was found on eight of those 15 farms from different environmental samples and on one farm where D. gallinae was not found. In two pooled samples Salmonella was isolated directly from the inner part of the cuticula from D. gallinae, which represents the first direct isolation of Salmonella from D. gallinae mites. Association between the level of biosecurity and the occurrence of D. gallinae and Salmonella was strong. The study indicates that proper biosecurity measures should be in place to lower the occurrence of D. gallinae and Salmonella.
Article
Objective: The aim of this study was to investigate the role of the poultry red mite (Dermanyssus [D.] gallinae) in the horizontal transmission of avian influenza A virus (AIV) to chickens. This mite is the most common ectoparasite in poultry worldwide, and may play a role in the spread of infectious agents including AIV. Currently, the control of mites is difficult due to frequently developed resistance to many acaricides, their nocturnality and their ability to survive hidden without feeding for months. Materials and methods: D. gallinae were collected in a commercial layer farm and housed in self-made fibreboard boxes. SPF chickens were intravenously infected with AIV strain A/turkey/Ontario/7732/1966 (H5N9). The viraemia in chickens was monitored and at an appropriate time point about 1000 mites were allowed to suck on the AIV infected chickens. Re-isolation of the virus from blood-filled mites was tried daily for 14 days using chicken embryo fibroblast cultures and embryonated chicken eggs. Subsequently, the virus containing mites were placed into boxes that contained naïve SPF chickens to enable virus transmission from mites to chickens. Possible transmission to the chickens was examined using clinical signs, serology, gross lesions, histopathology and immunohistochemistry. Results: Chickens developed a dose-dependent viraemia one day after infection, therefore this day was chosen for the bloodmeal of the mites. AIV was detected in mites after bloodsucking on AIV-infected chickens over a 10-day period. Naïve SPF chickens were infected during bloodsucking of AIV carrying mites. AIV isolates in mites and in chickens were undistinguishable from the original AIV inoculum by RT-PCR. Conclusions: D. gallinae ingested AIV during bloodmeals on AIV infected chickens and are able to transmit AIV to SPF chickens. Therefore, mites serve as mechanical vector of AIV and may play a major role in the circulation of AIV within a facility or area although the life span of infectious virus in the mite is limited. Clinical relevance: The proven transmission requires more than ever a systematic control of this ectoparasite in order to maintain poultry health and productivity. The demonstrated vector function of this mite is of great significance for poultry flocks all over the world.
Article
In a poultry house housing 60,000 egg layers, extremely numerous Dermanyssus gallinae populations developed in June 1998. Significant decrease in egg production was recorded (95 % - 70 %), and the amount of dead chickens increased from 5 to 52. Macrocytic and hypochrom anaemia was diagnosed clinically. The cause of this red poultry mite invasion was the persistence of 20° -30°C temperature inhouse for three weeks, which allowed rapid evolution of generations and offsprings survival near to biological potential of Dermanyssus gallinae species.
Article
The poultry red mite, D. gallinae has been involved in the transmission of many pathogenic agents, responsible for serious diseases both in animals and humans. Nowadays, few effective methods are available to control the ectoparasite in poultry farms. Consequently, this is an emerging problem which must be taken into account to maintain good health in commercial egg production. This paper addresses the vector capacity of the ectoparasite with special emphasis on salmonellae, pathogenic agents responsible for many of the most important outbreaks of food-borne diseases worlwide. It has been experimentally shown that D. gallinae could act as a biological vector of S. enteritidis and natural carriage of these bacteria by the mite on poultry premises has also been reported. It was also found that D. gallinae carried other pathogens such as E. coli, Shigella sp., and Staphylococcus, thus increasing the list of pathogenic agents potentially transmitted by the mite. © Springer Science+Business Media B.V. 2009. All rights reserved.