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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2010 > Volume 9 Number 2 > K. Suzuki1, M. Petruccelli1, G. Trenchi2, G. Giossa2, G. Rodrيguez2 and H. Trenchi2

Flock-Level Seroprevalence Against Ornithobacterium rhinotracheale among Broilers in Uruguay

K. Suzuki1, M. Petruccelli1, G. Trenchi2, G. Giossa2, G. Rodrيguez2 and H. Trenchi2
1Laboratorio de Diagnَstico de Enfermedades de las Aves y los Pilيferos, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Argentina2ءrea de Patologيa y Producciَn Avيcola, Facultad de Veterinaria, Universidad de la Repْblica, Montevideo, Uruguay
Abstract :

The objective of this study was to estimate the true prevalence of seropositive broiler flocks against
Ornithobacterium rhinotracheale in Uruguay, South America. Seventeen farms of broiler chickens greater
than 35 days of age were studied. The field investigation was conducted between October 2008 and April
2009. Individual-chicken sera and pooled sera (containing 10 individual-chicken sera each) were analyzed
using a commercial ELISA for the detection of antibody against Ornithobacterium rhinotracheale in chicken
serum. A total of 181 pooled samples from the study area representing 17 farms were examined. Fifty-four
pools were classified as test positive, because they included at least one individual-chicken classified as
positive. On the basis of deterministic approach, the estimates for the apparent prevalence and true
prevalence at flock-level were 30% and 17%, respectively. The true prevalence estimate with the Bayesian
model (stochastic approach) was slightly lower and having wider confidence intervals [11% (95% CI: 0%-
32%)].

Keywords :
Bayesian inference, pooling, rogan-gladen estimator

Date Deposited : 25 Jun 2011 10:33

Last Modified : 25 Jun 2011 10:33

Official URL: http://www.pjbs.org/ijps/ijps.htm

Volume 9, Number 2, - 2010 , ISSN 1682-8356

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