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ABSTRACT. Stelmann U.J.P., Camossi L.G., Silva R.C., Langoni H., Flausino W. & Lopes C.W.G. [Antibodies against Toxoplasma gondii (Apicomplexa: Toxoplasmatinae) in horses from Serrana microregion of the State of Rio de Janeiro, Brazil.] Anticorpos contra Toxoplasma gondii (Apicomplexa: Toxoplasmatinae) em equinos da microrregião Serrana do estado do Rio de Janeiro, Brazil. Revista Brasileira de Medicina Veterinária, 35(supl.2):22-27, 2013. Programa de Pós-Graduação em Ciência, Tecnologia e Inovação em Agropecuária, Universidade Federal Rural do Rio de Janeiro, Campus Seropédica, BR 465 km 7, Seropédica, RJ 23897-970, Brasil. E-mail: email@example.com The present study was done to determine the seroprevalence of Toxoplasma gondii infection in horses. A total of 375 blood samples from 23 agricultural establishments belonging to Serrana microregion, State of Rio de Janeiro, which comprises the municipalities of Petropolis, São José do Vale do Rio Preto and, Teresopolis. Indirect Immunofluorescence Test (IFAT) as cutoff title of 1:16 was used to determine positive horses. A questionnaire was also applied in these establishments to evaluate the risk factors inherent to properties and the animals that participated in this study. As result, antibodies against T. gondii were observed in 2.13% (8/375) of horses. There were no significant differences (p > 0.05) in the association between seropositive horses and all variables evaluated in this experiment.