Mycobacterium bovis, but also M. africanum present in raw milk of pastoral cattle in north-central Nigeria.
ABSTRACT Using deletion typing technique, five mycobacteria isolated from unpasteurised milk samples from cows in north-central Nigeria were characterized as Mycobacterium bovis (n = 4) and M. africanum (n = 1). This report emphasizes that transmission between the animal and human reservoir is a serious threat in Nigeria.
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ABSTRACT: Tuberculosis remains a global public health problem. In 2011, tuberculosis incidence was 133 per 100,000 in Nigeria. In Nigeria, little is known about the factors associated with tuberculosis, especially in the northern part and only few studies have characterized the Mycobacterium species that cause tuberculosis infection in humans. This study determined factors associated with tuberculosis and identified Mycobacterium species causing human tuberculosis in North-West, Nigeria.The Pan African medical journal. 01/2014; 18 Suppl 1:5.
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ABSTRACT: A retrospective study was conducted to investigate the prevalence of bovine tuberculosis and direct economic losses (DEL) from tuberculosis in cattle slaughtered in Makurdi abattoirs from 2008 to 2012, using abattoir records obtained from the Ministry of Agriculture and Natural Resources. Out of 61654 cattle slaughtered during the study period 1172 (1.90%) were positive for tuberculosis lesions. The annual prevalence of bovine tuberculosis ranges from 0.90% in 2008 to 4.04% in 2012. There was significant (P < 0.05) difference in annual prevalence of bovine tuberculosis. It was also observed that there was no seasonal difference in the prevalence of bovine tuberculosis. A total of 1935 affected organs by BTB weighing 3046.50 kg, amounting to 2.91 × 10(6) Naira (1.82 × 10(4) USD), were condemned within the study period. Seasonal variation in organ condemnation due to bovine tuberculosis was significantly different (Mann-Whitney U statistics = 774 × 10(3), P = 0.034). It was concluded that bovine tuberculosis is prevalent in Makurdi and accounts for heavy economic losses due to condemnation of edible organs.Veterinary medicine international. 01/2014; 2014:904861.
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ABSTRACT: Members of the Mycobacterium tuberculosis complex (MTBC) cause a serious disease with similar pathology, tuberculosis; in this review, bovine tuberculosis will be considered as disease caused by any member of the MTBC in bovids. Bovine tuberculosis is responsible for significant economic loss due to costly eradication programs and trade limitations and poses a threat to both endangered and protected species as well as to public health. We here give an overview on all members of the MTBC, focusing on their isolation from different animal hosts. We also review the recent advances made in elucidating the evolutionary and phylogenetic relationships of members of the MTBC. Because the nomenclature of the MTBC is controversial, its members have been considered species, subspecies or ecotypes, this review discusses the possible implications for diagnostics and the legal consequences of naming of new species.Research in Veterinary Science 10/2014; · 1.51 Impact Factor
Mycobacterium bovis, but also M. africanum present in raw
milk of pastoral cattle in north-central Nigeria
Simeon I. B. Cadmus & Mohammed K. Yakubu &
Abdullahi A. Magaji & Akinbowale O. Jenkins &
Dick van Soolingen
Accepted: 12 February 2010
# Springer Science+Business Media B.V. 2010
Abstract Using deletion typing technique, five mycobac-
teria isolated from unpasteurised milk samples from cows
in north-central Nigeria were characterized as Mycobacte-
rium bovis (n=4) and M. africanum (n=1). This report
emphasizes that transmission between the animal and
human reservoir is a serious threat in Nigeria.
Keywords Mycobacterium bovis.Pasteurization.
MTC Mycobacterium tuberculosis
National Population Commission
Regions of difference
In most African countries, consumption of unpasteurized
milk is a regular practice (Ayele et al. 2004) leading to
considerable risk of zoonotic infection with Mycobacterium
bovis and other mycobacteria. M. bovis has been isolated
earlier from unpasteurized milk and lesions of slaughtered
cattle in Nigeria, as well as from patients with pulmonary
and extrapulmonary tuberculosis (TB; Cadmus et al.
Most cow milk consumed in north-central Nigeria is
from livestock owners who are unaware of the public health
risks associated with bovine tuberculosis (BTB). To
estimate the risk of zoonotic transmission of mycobacteria,
we screened raw milk of pastoral cattle from north-central
Nigeria for these bacteria and identified them using a
Materials and methods
Study area The work was conducted at the South Agricul-
tural Zone of Niger State, north-central Nigeria.
Sample collection About 20 ml of milk was drawn from the
disinfected udder of selected cows into sterile universal
bottles from each of the 400 out of a total of 4,023 cattle
representing 10% of the 416 identified herds. Samples were
selected using the systematic sampling technique while the
herds were identified by physical randomization technique
Isolation of mycobacteria This was done as described by
Cadmus and Adesokan (2007), using Middlebrook 7H11
slopes and incubating at 37°C for 12 weeks.
S. I. B. Cadmus (*)
Department of Veterinary Public Health and Preventive Medicine,
University of Ibadan,
P.O. Box 21452, U.I. Post Office,
M. K. Yakubu:A. A. Magaji
Department of Veterinary Public Health and Animal Production,
Faculty of Veterinary Medicine, Usmanu Danfodiyo University,
P.M.B. 2346 Sokoto, Nigeria
A. O. Jenkins
Department of Veterinary Tropical Disease,
Faculty of Veterinary Sciences, University of Pretoria,
Pretoria, South Africa
D. van Soolingen
National Institute for Public Health and the Environment (RIVM),
3720 BA Bilthoven, The Netherlands
Trop Anim Health Prod
Deletion typing The RD9 deletion was used to distinguish
Mycobacterium tuberculosis from other members of the M.
tuberculosis complex (MTC; Warren et al. 2006). Isolates
with a deletion in this region were further investigated with
primers specific for RD4. This reaction distinguishes
between M. bovis, M. caprae, and other MTC.
Results and discussion
Of the 400 milk samples, five (1.25%) were positive by
culture and further molecular analysis identified four M.
bovis and one M. africanum (Table 1). Herd and individual
animal prevalence amounted to 10% (4/40) and 1.25% (5/
We report the first molecular characterisation of M. bovis
and M. africanum from unpasteurised milk of pastoral cattle
in north-central Nigeria. This may be an important finding
considering that although people in this region suffer from
tuberculosis, there are no documented literature to show a
reliable identification of Mycobacterium humans are ex-
The findings indicate that there is high herd prevalence
of BTB in this region, leading to serious public health
implications. Therefore, since BTB is endemic in Nigeria, it
becomes imperative to carry out surveillance programs to
forestall zoonotic spread going by the reports of Hlavsa et
al. (2008) and Ayele et al. (2004) that approximately 1.4%
of human tuberculosis cases in the developed countries and
3.1% in the developing countries, respectively, could be
attributed to M. bovis.
It is noticeable that not only M. bovis, but also M.
africanum was isolated from milk of cows. It is known that
the latter species is more related to M. bovis than M.
tuberculosis, but it remains unclear whether it is also
transmitted among cows, or whether this is an accidental
transmission of M. africanum from humans to cows as
reported several times for M. tuberculosis. However, the
presence of M. africanum in milk hints at a disseminated
infection in the cow, and this is to our knowledge, not
reported for this bacterium.
The limitations of this study (i.e., screening of limited
numbers of animals and lack of collection of specimens
from tuberculosis patients in adjoining hospitals to link
them directly with the animals or consumption of milk
products as recently done by Byarugaba et al. (2009) in
Uganda) notwithstanding, the habit of pooling milk in this
region poses great danger to people who consume them raw
as fresh or fermented product.
In conclusion, there is the need for pasteurization of milk
from pastoral herds in Nigeria to prevent zoonotic trans-
mission of tuberculosis.
Adesokan and Dr. Charity Agada for technical assistance. We are also
grateful to Dr Femi Faleke for his support at the inception of the study.
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2004. Bovine tuberculosis: an old disease but a new threat to
Africa, International Journal of Tuberculosis and Lung Diseases,
Byarugaba, F., Etter, E. M. C., Godreuil, S., Grimaud, P., 2009.
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Jahans, K., Hewinson, R.G. and Gordon, S.V., 2006. Molecular
analysis of human and bovine tubercle bacilli from a local setting
in Nigeria, Journal of Clinical Microbiology, 44, 29–34
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Table 1 Result of deletion typing
M. bovisM. africanum
Trop Anim Health Prod