Abstract
A cross-sectional study was carried out in a dairy goat herd, investigating the presence of rotavirus by means of ELISA, polyacrylamide gel electrophoresis (PAGE) and two latex agglutination tests in feces of 63 goat kids younger than 1 month, with and without diarrhea, and in feces of 19 adult goats during the first few days after parturition. All animals belonged to a herd located in the mountains of the León province (NW Spain). Rotaviruses were found in 18 out of 63 goat kid fecal samples but no significant association between shedding of rotavirus and presence of diarrhea could be established. Rotaviruses were found in kids aged 6 to 21 days, and more frequently between 6 and 10 days. No shedding of virus was detected in any of the adults. Considering ELISA as the reference test, PAGE and both latex agglutination tests were less sensitive. One of the latex tests was also highly non-specific. All PAGE-positive samples showed the typical electropherotype of group A rotavirus. Feces were also screened for other pathogens including Escherichia coli, Clostridium perfringens and Cryptosporidium parvum. C. parvum oocysts were detected in the feces of six out of 45 goat kids tested, all six suffering from diarrhea. This paper represents the first description of rotavirus infections in goats in Spain. The possible mechanisms of viral diffusion within the herd and its role as pathogen in goats are discussed.
Keywords: ELISA, Group A rotavirus, Goat kid, Latex agglutination, Polyacrylamide gel electrophoresis
Resumen
Se realizó un estudio de corte en una explotación de ganado caprino lechero investigando la presencia de rotavirus mediante ELISA, electroforesis en gel de poliacrilamida (PAGE) y 2 pruebas de aglutinación en látex en las heces de 63 cabritos menores de un mes, con y sin diarrea, y en las heces de 19 cabras durante los primeros días tras el parto. Todos los animales pertenecían a una explotación situada en la montaña de la provincia de León (NO de España). Se encontraron rotavirus en 18 de las 63 muestras fecales de cabritos analizadas, aunque no pudo demostrarse la existencia de asociación estadísticamente significativa entre la eliminación del virus y la presencia de diarrea. Las edades de los cabritos en que se detectó eliminación de rotavirus estaban comprendidas entre los 6 y los 21 días y más frecuentemente entre los 6 y los 10. Considerando ELISA como la prueba de referencia tanto PAGE como ambas pruebas de aglutinación en látex fueron menos sensibles. Una de las pruebas de aglutinación en látex fue también muy inespecífica. En todas las muestras positivas mediante electroforesis se observó el electroferotipo característico de los rotavirus del grupo A. También se estudió la presencia en las heces de otros patógenos como Escherichia coli, Clostridium perfringens y Cryptosporidium parvum. Se detectaron ooquistes de C. parvum en las heces de 6 de 45 cabritos investigados, los 6 padecían diarrea. Este trabajo representa la primera descripción de la infección por rotavirus en la especie caprina en España. Se discuten los posibles mecanismos de difusión del virus dentro de la explotación así como su papel como patógeno en cabras.
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