Prevalencia de infección por el virus del Nilo Occidental en dos zoológicos del estado de Tabasco / Prevalence of West Nile Virus infection in animals from two state zoos Tabasco

OBJETIVO: Determinar la prevalencia de infección por el virus del Nilo Occidental (VNO) en animales, mosquitos y personal que labora en dos zoológicos del estado de Tabasco, en México. MATERIAL Y MÉTODOS: Con la utilización de ELISA de bloqueo se detectaron anticuerpos en sueros de animales: se buscó un fragmento del genoma del VNO por RT-PCR en el suero de animales, empleados y mosquitos. RESULTADOS: En el zoológico "La Venta" se encontró una seroprevalencia de 25.67 por ciento (19/74) en aves y de 85.71 por ciento (6/7) en reptiles. En el zoológico "Yum-Ká", 31.25 por ciento (50/160) de las aves y 34.48 por ciento (16/29,) de los mamíferos, tuvieron anticuerpos contra el VNO. En un grupo de mosquitos (Culex quinquefasciatus) se detectó el genoma del virus. CONCLUSIONES: La detección de anticuerpos contra el VNO en animales de ambos zoológicos y del genoma viral en mosquitos demuestra la presencia del virus, lo cual representa un riesgo potencial de infección para animales y humanos.

OBJECTIVE: To determine the prevalence of West Nile Virus (WNV) infection in animals, mosquitoes and employees from two zoos of Tabasco state, Mexico. MATERIAL AND METHODS: WNV antibodies were detected by blocking ELISA in serum samples from animals. Viral RNA was detected by RT-PCR from mosquitoes and serum samples from employees at "Yum-Ká" zoo. RESULTS: Seroprevalence in birds was 25.65 percent (19/74) and 85 percent (6/7) in reptiles from "La Venta" zoo. Thirty-one percent of birds (50/160) and 34.48 percent mammals (16/29) at the "Yum-Ká" zoo, were seropositive. All human serum samples from Yum-ká zoo were negative by RT-PCR. A pool of mosquitoes (Culex quinquefasciatus) was positive for WNV. CONCLUSIONS: The presence of WNV antibodies in animals from both zoos and the detection of viral genome in mosquitoes demonstrate the presence of WNV in this region and indicates a potential risk of infection in animals and humans.

effect of steady magnetic fields on the ionic contents of mosquito larvae [culex pipiens]

The effect of steady magnetic fields of different strength and orientation, on the ionic contents of Mosquito Larvae [Culex Pipiens] was studied. The data indicate that the Na, K, Ca, Mg, Fe and Cl content of the whole insects are under the controlled magnetic field, is highly affected by both the distribution of magnetic lines of force and the strength of the field