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Prev Vet Med ; 103(2-3): 163-9, 2012 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-21993274

RESUMO

A cross-sectional study was carried out to determine Visna/Maedi virus (VMV) seroprevalence and risk factors in semi-intensive lamb-producing flocks as a prelude to establishing a monitoring program in northwestern (NW) Spain. A total of 15,155 serum samples were taken from 78 commercial flocks and were submitted to an indirect VMV ELISA. Association between potential risk factors and seroprevalence at the flock level was assessed using a multivariable logistic regression model. A Generalized Estimating Equations (GEE) model and Exhaustive Chi-squared Automatic Interaction Detector (CHAID) were used to determine the seropositivity against VMV at the individual animal level. Individual seropositivity was 24.8% while 52.6% of the flocks examined had a true seroprevalence ≥1%. Flock size and introduction of new animals in the flock were significantly associated with seropositivity at the flock level. Flock size, sheep-goat contact, type of housing of lambs prior to weaning and age were significantly associated with individual VMV seropositivity. Confinement of lambs in preweaning lamb groups and high sheep-goat contact, regardless of the low number of goats per flock, were risk factors associated with individual VMV seropositivity, suggesting that these two factors are crucial for VMV control in semi-intensive lamb-producing flocks. These factors should be considered for developing more efficient strategies that will reduce the rate of VMV transmission.


Assuntos
Criação de Animais Domésticos , Vírus Visna-Maedi/fisiologia , Visna/epidemiologia , Visna/transmissão , Fatores Etários , Animais , Distribuição de Qui-Quadrado , Estudos Transversais , Ensaio de Imunoadsorção Enzimática/veterinária , Feminino , Cabras , Abrigo para Animais , Modelos Logísticos , Masculino , Análise Multivariada , Prevalência , Fatores de Risco , Estudos Soroepidemiológicos , Ovinos , Espanha/epidemiologia , Visna/sangue , Visna/prevenção & controle
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