Publications

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the u.s.-mexico border infectious disease surveillance project: establishing bi-national border surveillance.in 1997, the centers for disease control and prevention, the mexican secretariat of health, and border health officials began the development of the border infectious disease surveillance (bids) project, a surveillance system for infectious diseases along the u.s.-mexico border. during a 3-year period, a binational team implemented an active, sentinel surveillance system for hepatitis and febrile exanthems at 13 clinical sites. the network developed surveillance protocols, trained nine surveilla ...200312533288
specific genetic markers for detecting subtypes of dengue virus serotype-2 in isolates from the states of oaxaca and veracruz, mexico.dengue (den) is an infectious disease caused by the den virus (denv), which belongs to the flavivirus genus in the family flaviviridae. it has a (+) sense rna genome and is mainly transmitted to humans by the vector mosquito aedes aegypti. dengue fever (df) and dengue hemorrhagic fever (dhf) are caused by one of four closely related virus serotypes (denv-1, denv-2, denv-3 and denv-4). epidemiological and evolutionary studies have indicated that host and viral factors are involved in determining ...200818625078
detection of flaviviruses and orthobunyaviruses in mosquitoes in the yucatan peninsula of mexico in 2008.a total of 191,244 mosquitoes from 24 species were collected in the yucatan peninsula of mexico from january to december 2008, and tested for the presence of cytopathic virus by virus isolation in vero cells. eighteen virus isolates were obtained, all of which were orthobunyaviruses. these were identified by reverse transcription-polymerase chain reaction (rt-pcr) and nucleotide sequencing as cache valley virus (n=17) and south river virus (n=1). a subset (n=20,124) of culex quinquefasciatus col ...201020370430
host-feeding preference of the mosquito, culex quinquefasciatus, in yucatan state, mexico.studies were conducted to determine the host-feeding preference of culex quinquefasciatus say (diptera: culicidae) in relation to the availability of human and domestic animals in the city of merida, yucatan state, mexico. mosquitoes were collected in the backyards of houses using resting wooden boxes. collections were made five times per week from january to december 2005. dna was extracted from engorged females and tested by pcr using universal avian- and mammalian-specific primers. dna extrac ...201020578953
variation in vector competence for dengue viruses does not depend on mosquito midgut binding affinity.dengue virus genotypes of southeast asian origin have been associated with higher virulence and transmission compared to other genotypes of serotype 2 (den-2). we tested the hypothesis that genetic differences in dengue viruses may result in differential binding to the midgut of the primary vector, aedes aegypti, resulting in increased transmission or vectorial capacity.201121610852
serologic evidence of flavivirus infection in bats in the yucatan peninsula of mexico.we captured 140 bats of seven species in merida city in the yucatan peninsula of mexico in 2010. serum was collected from each bat and assayed by plaque reduction neutralization test (prnt) using six flaviviruses: west nile virus, st. louis encephalitis virus, and dengue viruses 1-4. flavivirus-specific antibodies were detected in 26 bats (19%). the antibody-positive bats belonged to three species: the pallas's long-tongued bat (glossophaga soricina), jamaican fruit bat (artibeus jamaicensis), a ...023778622
aedes (stegomyia) aegypti and aedes (howardina) cozumelensis in yucatán state, méxico, with a summary of published collection records for ae. cozumelensis.we collected mosquito immatures from artificial containers during 2010-2011 from 26 communities, ranging in size from small rural communities to large urban centers, located in different parts of yucatán state in southeastern méxico. the arbovirus vector aedes (stegomyia) aegypti was collected from all 26 examined communities, and nine of the communities also yielded another container-inhabiting aedes mosquito: aedes (howardina) cozumelensis. the communities from which ae. cozumelensis were coll ...023181861
seroprevalence of neutralizing antibodies against dengue virus in two localities in the state of morelos, mexico.humoral immune response against dengue virus (denv) is an important component in dengue-endemic transmission. we conducted a cross-sectional nested cohort study to determine the seroprevalence and frequency of neutralizing antibodies against denv serotypes in two endemic localities in the state of morelos, mexico. the cohort participants (n = 1,196) were screened to determine previous exposure to denv. overall seroprevalence was 76.6% (95% confidence interval [95% ci] = 73.6-79.2), and prevalenc ...201425294613
first report of aedes aegypti transmission of chikungunya virus in the americas.during a chikungunya fever outbreak in late 2014 in chiapas, mexico, entomovirological surveillance was performed to incriminate the vector(s). in neighborhoods, 75 households with suspected cases were sampled for mosquitoes, of which 80% (60) harbored aedes aegypti and 2.7% (2) aedes albopictus. a total of 1,170 ae. aegypti and three ae. albopictus was collected and 81 pools were generated. although none of the ae. albopictus pools were chikungunya virus (chikv)-positive, 18 ae. aegypti pools ( ...201526416113
cleaning products, environmental awareness and risk perception in mérida, mexico.cleaning products are associated with many health and environmental problems. contamination of water resources by cleaning products is more likely to occur with septic tanks as sewage treatment systems especially in karstic terrains. we explored women's ideas about water sources and the risk cleaning products pose to health and sewage in mérida, a city in the yucatán peninsula of mexico. women were unaware of the city's water management system. we found a positive and statistically significant a ...201324009770
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
antibodies to west nile virus in wild and farmed crocodiles in southeastern mexico.surveillance for evidence of west nile virus (wnv) infection in morelet's crocodiles (crocodylus moreletii) was conducted in campeche state, mexico, in 2007. sera from 62 crocodiles (32 free-ranging and 30 captive) were assayed for antibodies to wnv by epitope-blocking enzyme-linked immunosorbent assay. antibodies to wnv were detected in 13 (41%) wild and nine (30%) captive crocodiles, and the overall antibody prevalence was 35%. although evidence of wnv infection in captive crocodiles has been ...023778623
venezuelan equine encephalitis virus activity in the gulf coast region of mexico, 2003-2010.venezuelan equine encephalitis virus (veev) has been the causative agent for sporadic epidemics and equine epizootics throughout the americas since the 1930s. in 1969, an outbreak of venezuelan equine encephalitis (vee) spread rapidly from guatemala and through the gulf coast region of mexico, reaching texas in 1971. since this outbreak, there have been very few studies to determine the northward extent of endemic veev in this region. this study reports the findings of serologic surveillance in ...201223133685
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
first evidence of aedes albopictus (skuse) in southern chiapas, mexico. 200312737750
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