Publications

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association of venezuelan equine encephalitis virus subtype ie with two equine epizootics in mexico.two outbreaks of encephalitis consistent with an etiology of venezuelan equine encephalitis (vee) virus occurred in equines on the pacific coast of southern mexico in 1993 (chiapas state) and in 1996 (oaxaca state). in chiapas, there were 125 cases, of which 63 were fatal and in oaxaca, there were 32 cases and 12 fatalities. virus was isolated from two horses from each outbreak, including three brain isolates and one from blood. virus isolates (93-42124, iset-chi93, oax131, and oax142) were show ...19989684636
vector competence of mexican and honduran mosquitoes (diptera: culicidae) for enzootic (ie) and epizootic (ic) strains of venezuelan equine encephalomyelitis virus.experimental studies evaluated the vector competence of ochlerotatus taeniorhynchus (wiedemann), culex cancer theobald, culex pseudes (dyar and knab), culex taeniopus dyar and knab, and a culex (culex) species, probably culex quinquefasciatus say, and culex nigripalpus theobald from chiapas, mexico, and tocoa, honduras, for epizootic (ic) and enzootic (ie) strains of venezuelan equine encephalomyelitis (vee) virus. culex pseudes was highly susceptible to infection with both the ic and ie strains ...200312943109
serologic survey of domestic animals for zoonotic arbovirus infections in the lacandón forest region of chiapas, mexico.a serologic survey in domestic animals (birds and mammals) was conducted in four communities located in the lacandón forest region of northeastern chiapas, mexico, during june 29 to july 1, 2001, with the objective to identify zoonotic arboviruses circulating in this area. we collected 202 serum samples from healthy domestic chickens, geese, ducks, turkeys, horses and cattle. the samples were tested by plaque-reduction neutralization test for antibodies to selected mosquito-borne flaviviruses (f ...200312804375
venezuelan equine encephalitis virus, southern mexico.equine epizootics of venezuelan equine encephalitis (vee) occurred in the southern mexican states of chiapas in 1993 and oaxaca in 1996. to assess the impact of continuing circulation of vee virus (veev) on human and animal populations, serologic and viral isolation studies were conducted in 2000 to 2001 in chiapas state. human serosurveys and risk analyses indicated that long-term endemic transmission of veev occurred among villages with seroprevalence levels of 18% to 75% and that medical pers ...200415663847
the continuous spread of west nile virus (wnv): seroprevalence in asymptomatic horses.west nile virus (wnv) was probably introduced in southern and northern mexico from the usa in two independent events. since then, wnv activity has been reported in several mexican states bordering the usa and the gulf of mexico, but disease manifestations seen there in humans and equids are quite different to those observed in the usa. we have analysed wnv seroprevalence in asymptomatic, unvaccinated equids from two mexican states where no data had been previously recorded. wnv igg antibodies we ...200919288961
experimental infection of potential reservoir hosts with venezuelan equine encephalitis virus, mexico.in 1993, an outbreak of encephalitis among 125 affected equids in coastal chiapas, mexico, resulted in a 50% case-fatality rate. the outbreak was attributed to venezuelan equine encephalitis virus (veev) subtype ie, not previously associated with equine disease and death. to better understand the ecology of this veev strain in chiapas, we experimentally infected 5 species of wild rodents and evaluated their competence as reservoir and amplifying hosts. rodents from 1 species (baiomys musculus) s ...200919331726
biodiversity and distribution of helminths and protozoa in naturally infected horses from the biosphere reserve la sierra madre de chiapas", méxico.a cross sectional survey was performed to identify gastrointestinal helminths and protozoans in naturally infected horses from the biosphere reserve known as "la sierra madre de chiapas", mexico (el triunfo and la sepultura). during a three-year survey, fecal samples from 90 horses and parasites from 2 necropsied animals were collected. five families from the nematoda class: ascaridae, kathlanidae, oxyuridae, strongylidae and trichostrongylidae were found, whereas, only one family from the class ...201020307938
candidate vectors and rodent hosts of venezuelan equine encephalitis virus, chiapas, 2006-2007.enzootic venezuelan equine encephalitis virus (veev) has been known to occur in mexico since the 1960s. the first natural equine epizootic was recognized in chiapas in 1993 and since then, numerous studies have characterized the etiologic strains, including reverse genetic studies that incriminated a specific mutation that enhanced infection of epizootic mosquito vectors. the aim of this study was to determine the mosquito and rodent species involved in enzootic maintenance of subtype ie veev in ...201122144461
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