The objective of this study was to conduct a seroepidemiological survey of Chlamydia abortus infection in dairy cattle herds. A total of 303 blood serum samples were collected from 24 property in Vale do Ipanema microregion in the state of Pernambuco, Brazil. For the diagnosis of C. abortus infection, a commercial enzyme immunoassay kit (ELISA) was used. A prevalence of 34.0% (103/303; 95% CI: 28.7%-39.7%) of infected animals was identified. In 79.8% (19/24) of the properties, at least one infected animal was detected. The risk factors identified were: semi-intensive system (OR = 3.47, p ≤ 0.000), extensive system (OR = 8.14; p ≤ 0.000), supply of water in troughs and directly at the fountain (OR = 2.29, p = 0.002), pasture rent (OR = 1.72, p = 0.041), use of artificial insemination (AI) (OR = 3.07, p = 0.002), and use of AI associated with natural mount (OR = 2.22, p = 0.003). The occurrence of C. abortus infection in dairy cattle in the state of Pernambuco, Brazil, was recorded for the first time. It is concluded that the infection by this agent is present in the analyzed herds and that hygienic and sanitary management measures based on the identified risk factors should be implemented to avoid reproductive losses and losses to the producers.
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