Prevalence and risk factors associated with infection by Chlamydophila abortus in commercial pig farms in the state of Alagoas, Brazil

Valenca R.M.B., Mota, R.A., Piatti, R.M., Anderlini G.A., Pinheiro Junior J.W., Valenca S.R.F.A. & Guerra M.M.P. 2011. [Prevalence and risk factors associated with infection by Chlamydophila abortus in commercial pig farms in the state of Alagoas, Brazil.] Prevalencia e fatores de risco associados a infeccao por Chlamydophila abortus em granjas suinicolas tecnificadas no Estado de Alagoas, Brasil. Pesquisa Veterinaria Brasileira 31(1):31-35. Departamento de Medicina Veterinaria, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil. E-mail: rinaldo.mota@hotmail.com The objective of this study was to determine the prevalence and identify risk factors associated with Chlamydophila abortus infection in commercial swine farms on the state of Alagoas, Brazil. To compose the study sample 342 pigs were used, with 312 sows and 30 boars from seven swine farms and distributed in five districts of the Alagoas. The serological diagnosis of infection by C. abortus was performed by fixation of complement microtechnique (RFC). The analysis of risk factors were performed by the application of research questionnaires, consisting of objective questions relating to the designer, the general characteristics of the property, the production, reproductive and health management. I was observed a prevalence of 10.5% (36/342) of pigs seropositive for infection by C. abortus with 85.8% of farms with positive animals analyzed. The variables that showed significant association were use of common drinker for young and adults pigs (p=0.024, OR=10.83, CI=1.36-86.03) and associated the natural mount with artificial insemination (p=0.05, OR=7.62, CI=1.00-58.31). This work reports the first occurrence of anti-C. abortus in pigs in Brazil. Factors as the introduction of boars in herds and the form of water supply were seen as facilitators of infection on sows in this study. Thus measures of infection control should be focused on this aspect to prevent the spread of the agent in pig farms and other herds in the region.