Abstract
136 fecal samples, collected from 47 dairy calves on a calf ranch and in a dairy herd in California, were tested for the presence of group A and group B rotaviruses by reverse transcription-polymerase chain reaction (RT-PCR). Samples were collected from each calf at days 1, 7 and 14. Within the 14 day period, 44 calves (94%) were positive for group A rotavirus and an unexpectedly high number of calves (38 calves, 81%) were positive for group B rotavirus. When these samples were examined by polyacrylamide gel electrophoresis (PAGE), rotavirus was found in 21 calves and all of them had group A electropherotype. Among 25 PAGE positive samples from 21 calves, 17 (68%) were of short electropherotype, 4 (28%) were of long electropherotype and 4 (28%) contained both short and long electropherotype rotaviruses. Group B and short and long electropherotype group A rotaviruses were found in both normal and diarrheic calves.
Keywords: Group A bovine rotavirus, group B bovine rotavirus, rotaviral diarrhea, reverse transcription-polymerase chain reaction (RT-PCR), polyacrylamide gel electrophoresis (PAGE), short electropherotype
Résumé
136 échantillons de matières fécales furent récoltés sur 47 veaux appartenant à un élevage de veaux et à une exploitation laitière, localisés en Californie. Les matières fécales furent obtenues pour chaque veau à l'age de 1, 7, et 14 jours. La présence de rotavirus groupe A et B dans ces échantillons fut déterminée par transcription-réversé polymerase chaine réaction (RT-PCR). A 14 jours, 44 veaux (94%) étaient positifs pour le rotavirus du group A, et un plus grand nombre de veaux qu'anticipé (38 veaux, 81%) était positif pour le rotavirus du groupe B. L'examen des échantillons de matières fécales par électrophorèse sur gel de polyacrylamide (PAGE), révela que 21 veaux étaient positifs pour l'électropherotype des rotavirus du groupe A. Sur les 25 échantillons déterminés positifs pour les rotavirus du groupe A par électrophorèse et obtenus sur 21 veaux, 17 (68%) étaient de l'électropherotype court, 4 (28%) étaient de l'électropherotype long, et 4 (28%) contenaient les 2 électropherotypes. Rotavirus du groupe B, et les deux électropherotypes du groupe A (court et long) étaient présent dans les matières fécales de avec ou sans diarrhée.
Mots-clé: Rotavirus bovin groupe A, rotavirus bovin groupe B, diarrhée infectieuse à rotavirus, transcription-réversé polymerase chaine réaction, électrophorése sur gel de polyacrylamide, électropherotype court
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