Armando Ulloa

Autonomous University of Chiapas · Facultad de Ciencias Químicas

La fiebre de Oropouche es transmitida a los seres humanos por picadura de mosquitos Culicoides paraensis y Culex quinquefasciatus infectados, especies distribuidas en las zonas tropicales y subtropicales; en la figura se muestra un ejemplar del mosquito de la especie Culex.

The objective of this work was to determine the cuticular hydrocarbon variation in female and male Aedes aegypti at each of their reproductive stages. Cuticular hydrocarbons were extracted with hexane and identified by gas chromatography-mass spectrometry. In all the reproductive stages of both sexes, heptacosane and the coeluted compounds 13-methy...

Rhipicephalus sanguineus sensu lato (s.l.) (Latreille) feeds on domestic dogs worldwide. This tick species uses dog volatiles during host-seeking behavior. In this study, we identified volatile compounds from dog hairs involved in the host location of R. sanguineus s.l. The R. sanguineus s.l. females, but not males, were attracted to hair samples a...

More than ever, there is a need to understand how pathogens, vectors and hosts occur temporally and spatially to predict the occurrence of zoonotic outbreaks. Related to this, mites of the Mesostigmata and Trombidiformes orders have the potential to transmit several diseases, yet their information of occurrence, distribution and zoonotic accompanyi...

Objective: To determine the time of oogenic development and the length of the gonotrophic cycle of Ae. aegypti and Ae. albopictus in laboratory. Materials and methods: Bloodfed females of Ae. aegypti and Ae. albopictus were dissected every 4 h to determine the development status of the follicles according to the Christophers' stages. Results:...

Objective: To determine the presence of Rickettsia typhi in Rhipicephalus sanguineus s.l. and Amblyomma mixtum in southern Mexico. Materials and methods: Ticks were collected in humans and domestic animals. The presence of Rickettsia was determined by PCR and sequencing. Results: 10/39 work vials amplified fragments of the gltA, htrA and ompB...

En el mundo se reportan más de 3,000 especies de mosquitos. La familia Culicidae incluye 2 subfamilias, 11 tribus, 113 generos y 3,563 especies (1). Los generos más importantes de la familia Culicidae son Anopheles, Aedes y Culex. En México se tienen identificados entre 18 y 20 géneros y 225-247 especies de mosquitos (2). A pesar de esta alta biodi...

Las rickettsiosis son zoonosis causadas por bacterias del género Ricketsia........

Las rickettsiosis son zoonosis causadas por bacterias del género Rickettsia, las cuales se dividen en los grupos Tifus y Fiebres Manchadas. Rickettsia rickettsii es el agente causal de la fiebre manchada de las Montañas Rocosas y la especie más patogénica del género y ha provocado una alta mortalidad en los últimos años, especialmente en países com...

Aedes aegypti is the vector of the arboviruses causing dengue, chikungunya and zika infections in Mexico. However, its presence in public places has not been fully evaluated. In a cemetery from Merida, Yucatan, Mexico, the productivity of Ae. aegypti, the gonotrophic cycle, and the presence of Ae. aegypti females infected with arboviruses were eval...

The majority of the Yucatán State, México, presents subtropical climate that is suitable for many species of mosquitoes that are known to be vectors of diseases, including those from the genera Aedes and Culex. The objective of this study is to identify the geographic distribution of five species from these two genera and estimate the human populat...

Blood-feeding status, gonotrophic cycle, and survival rates of Aedes (Stegmyia) aegypti (L.) was investigated in catholic churches from Merida, Yucatan. Female Ae. aegypti were caught using backpack aspirator during 25 consecutive days in rainy (2015) and dry season (2016). Blood-feeding status was determined by external examination of the abdomen...

We characterized a La Crosse virus (LACV) isolate from the brain of a child who died of encephalitis-associated complications in eastern Tennessee, USA, during summer 2012. We compared the isolate with LACV sequences from mosquitoes collected near the child's home just after his postmortem diagnosis. In addition, we conducted phylogenetic analyses...

La Crosse encephalitis (LAC) is the leading arboviral disease among children, and was previously limited to the upper Midwest. In 2012 nine pediatric cases of LAC occurred in eastern Tennessee, including one fatal case. In an attempt to identify sites near an active LACv infection and describe the abundance and distribution of potential LACv vector...

Background Dengue fever (DF) is the most prevalent arthropod-borne viral disease affecting humans. The World Health Organization (WHO) proposed a revised classification in 2009 to enable the more effective identification of cases of severe dengue (SD). This was designed primarily as a clinical tool, but it also enables cases of SD to be differentia...

In this study, we designed a new tent trap; the BioDiVector (BDV) tent trap, consisting of two rectangular tents that use human bait without endangering the technical personnel. The daily activity pattern of Aedes aegypti and Aedes albopictus in intra, peri, and extradomiciliary sites was studied in an endemic area of dengue in southern Mexico by u...

The aim of this study was to determine the presence of West Nile Virus (WNV) in mosquitoes in northeastern Venezuela. Research was conducted in the Laguna de los Patos, Cumana, Sucre State to demonstrate the presence of WNV RNA in mosquitoes caught in traps of Light (CDC + CO2) by RT-PCR, during the period July 2007 to February 2008. We found a pos...

This paper will identify areas of application of good practices which emerged from international and interdisciplinary research on social suffering in urban spaces and on change agentry with intercultural sensitivity, which is at the basis of a new concept of co-operation for local development. Three examples of possible good practices are describe...

OBJECTIVE: To determine the relative importance of Aedes aegyti breeding sites for potential targeted dengue control interventions in Morelos. MATERIAL AND METHODS: Cross-sectional entomological surveys were conducted and collection of Ae. aegypti pupae was taken from all water-holding containers in Cuautla, Jojutla and Tlaquiltenango during dry (1...

To determine the relative importance of Aedes aegyti breeding sites for potential targeted dengue control interventions in Morelos. Cross-sectional entomological surveys were conducted and collection of Ae. aegypti pupae was taken from all water-holding containers in Cuautla, Jojutla and Tlaquiltenango during dry (1,713 households) and rainy (1,677...

Odonate nymphs are important predators of the immature aquatic stages of mosquitoes. Populations of the malaria vector Anopheles pseudopunctipennis Theobald (Diptera: Culicidae) can be efficiently reduced by extraction of filamentous algae from river pools in southern Mexico. Here, we examined the influence of this intervention on the diversity of...

This work describes the bioethics situation in Nicaragua, with information on the circumstances and the context of activities in medical education and health care providers. The development of a new model of comprehensive health care-the implementation of health care policies that guarantee Nicaraguans better access to care and services free of cha...

Extraction of filamentous algae from river pools is highly effective for the control of Anophelespseudopunctipennis in southern Mexico. We determined the magnitude of changes to the aquatic insect community following single annual perturbations performed over two years. In 2001, algae were manually removed from all the pools in a 3 km long section...

Two colonies of Anopheles pseudopunctipennis, Tapachula and Abasolo strains, were established under laboratory conditions with a thermoperiod (29 degrees C during the day; 24 degrees C during the night) and artificial dusk. To stimulate mating, a light beam from a flashlight was shone on the cage shortly after lights off. This procedure was repeate...

The abundance and age structure of Anopheles albimanus populations were estimated by UV updraft light traps and human landing catches within villages and in nearby breeding sites of southern México. Four villages and 5 breeding sites were selected for the study. Light trap and human landing catches were simultaneously carried out in each breeding s...

A landscape approach using remote sensing and geographic information system (GIS) technologies was developed to discriminate between villages at high and low risk for malaria transmission, as defined by adult Anopheles albimanus abundance. Satellite data for an area in southern Chiapas, Mexico were digitally processed to generate a map of landscape...