PREVALENCE OF ANTIBODIES AGAINST INFLUENZA VIRUS IN NON-VACCINATED EQUINES FROM THE BRAZILIAN PANTANAL

Revista do Instituto de Medicina Tropical de São Paulo

Lucas Gaíva E Silva¹  Alice Mamede Costa Marques Borges¹  Eliana Monteforte Cassaro Villalobos¹  Maria Do Carmo Custodio Souza Hunold Lara¹  Elenice Maria Siquetin Cunha¹  Anderson Castro Soares De Oliveira¹  Ísis Assis Braga¹  Daniel Moura Aguiar¹ 

关键词: Equine;    Influenza virus;    Pantanal;    Brazil;    Prevalence;   

DOI  :  10.1590/S0036-46652014000600006

来源: SciELO

【 摘 要 】

The prevalence of antibodies against Equine Influenza Virus (EIV) was determined in 529 equines living on ranches in the municipality of Poconé, Pantanal area of Brazil, by means of the hemagglutination inhibition test, using subtype H3N8 as antigen. The distribution and possible association among positive animal and ranches were evaluated by the chi-square test, spatial autoregressive and multiple linear regression models. The prevalence of antibodies against EIV was estimated at 45.2% (95% CI 30.2 - 61.1%) with titers ranging from 20 to 1,280 HAU. Seropositive equines were found on 92.0% of the surveyed ranches. Equine from non-flooded ranches (66.5%) and negativity in equine infectious anemia virus (EIAV) (61.7%) were associated with antibodies against EIV. No spatial correlation was found among the ranches, but the ones located in non-flooded areas were associated with antibodies against EIV. A negative correlation was found between the prevalence of antibodies against EIV and the presence of EIAV positive animals on the ranches. The high prevalence of antibodies against EIV detected in this study suggests that the virus is circulating among the animals, and this statistical analysis indicates that the movement and aggregation of animals are factors associated to the transmission of the virus in the region.

【 授权许可】

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