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Epidemiologic association between antibody titres against bovine virus diarrhoea virus, rinderpest disease virus and infectious bovine rhinotracheitis virus in a buffalo herd

Association Epidemiologique Entre Les Titres d'Anticorps Contre Le Virus De La Diarrhee Virale Bovine (VDVB), Le Virus De La Peste Du Betail (RPDV) Et Le Virus De La Rhinotracheite Infectieuse Bovine (IBRV) Dans Un Troupeau De Buffles

Asociacion Epidemiologica Entre Los Titulos De Anticuerpos Frente Al Virus De La Diarrea Virica Bovina, El Virus De La Peste Bovina Y El Virus De La Rinotraqueitis Infecciosa Bovina En Un Rebano De Bufalos

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Summary

The association between antibody titres against bovine virus diarrhoea virus (BVDV), infectious bovine rhinotracheitis virus (IBRV) and rinderpest disease virus (RPDV) in buffaloes was investigated in a cross-sectional study. Thirty-six lactating buffaloes from a herd in Landhi Cattle Colony, Karachi were bled and serum samples subjected to a micro-neutralisation test at the Plum Island Animal Disease Center, USA, to categorise each buffalo either as positive or negative against each of 3 viral antigens. Log-linear analysis was used to evaluate the association among 3 categorical variables.

The “best-fitting” log-linear model was the model of complete independence. This model includes all 3 main effects (BVDV, IBRV, RPDV), suggesting that the seropositivity of buffaloes against these viral antigens tended to occur independently. Estimates of parameters of the model showed that the proportion of buffaloes seropositive (97·2%) to RPDV antigen tended to be higher than expected, whereas the proportion of BVDV seropositive (30·6%) and IBRV seropositive (16·7%) buffaloes tended to be smaller than expected.

Résumé

L'association entre les titres d'anticorps contre le virus de la diarrheé virale bovine (VDVB), le virus de la rhinotrachéite infectieuse bovine (IBRV) et le virus de la peste du bétail (RPDV) fut analysé chez des buffles par une étude trans-sectionnelle. Pour 36 buffles, en période d'allaitement, d'un troupeau de Landhi, Karachi du sang fut prélevé et les sérums furent soumis au test de micro-neutralisation au Plum Island Animal Disease Centre, USA, pour répartir chaque buffle comme positif ou négatif pour chacun des 3 antigènes viraux. Une analyse logarithmique fut utiliseé pour évaluer l'association des variables.

Le modèle logarithmique le plus concordant fut le modèle d'indépendance complète. Ce modèle considère 3 principaux évènements (VDVB, RPDV, IBRV) suggèrant que la séropositivité des buffles face aux antigènes viraux est indépendante.

L'évaluation des composantes du modèle montra que la proportion des buffles séropositifs (97,2%) pour l'antigène du RPDV tendait à être plus élevé que prévu alors que la porportion de buffles séropositifs pour VDUB (30,6%) et pour IBRV (16,7%) tendait à être plus faibles que prévu.

Resumen

Se investigó la asociación entre los títulos de anticuerpos frente al virus de la diarrea vírica bovina (BVDV), el virus de la rinotraqueítis infecciosa bovina (IBRV) y el virus de la peste bovina (RPDV) en búfalos. Se obtuvieron muestras de suero de 36 búfalas en lactación procedentes de la Landhi Cattle Colony de Karachi. Dichas muestras fueron sometidas al test de microneutralización en el Plum Animal Disease Center de los Estados Unidos con objeto de clasificar cada animal como positivo o negativo frente a cada uno de los 3 antígenos virales. Se utilizó un modelo semilogarítmico para evaluar la asociación entre las tres variables.

El modelo semilogarítmoco que mejor se ajustó a los resultados fue el de independencia completa. Dicho modelo incluye los 3 efectos principales (BVDV, IBRV y RPDV) y sugiere por tanto que la seropositividad de los búfalos frente a los tres antígenos ocurre independientemente. Las estimaciones de los parámetros del modelo mostraron que la proporción de búfalos seropositivos frente al RPDV (97·2%) tendió a ser superior a la esperada, mientras que la proporción de seropositivos frente al BVDV (30·6%) y al IBRV (16·7%) tendió a ser inferior a la esperada.

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Akhtar, S., Asif, M. Epidemiologic association between antibody titres against bovine virus diarrhoea virus, rinderpest disease virus and infectious bovine rhinotracheitis virus in a buffalo herd. Trop Anim Health Prod 28, 207–212 (1996). https://doi.org/10.1007/BF02240936

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