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ABSTRACT. Flausino W., De Jesus V.L.T., Bezerra R.A., Albuquerque G.R., Jorge J.L.B.P., Rodrigues J. da S., Meireles G.S. de & Pereira R. de C.G. [Ocurrence of antibodies Anti-Toxoplasma gondii in pigs in a commercial breeding in the State of Rio de Janeiro]. Ocorrência de anticorpos anti-Toxoplasma gondii em suínos de um sistema de criação comercial no estado do Rio de Janeiro. Revista Brasileira de Medicina Veterinária, 32(4):198-200, 2010. Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro. BR- 465 km 7. Seropédica, 23.890-000, RJ, Brasil. E-mail: email@example.com In order to evaluate the occurrence of anti-T. gondii in pigs from Pinheiral municipality, state of Rio de Janeiro, were collected and examined blood samples from 282 animals from a commercial farm. The serum samples were tested at enzyme linked immunosorbent assay (ELISA) for detecting antibodies to Toxoplasma gondii and considered as positive those with reaction at dilution ≥1:16. Of the 282 swine serum samples, 35 (12.41%) were positive for anti-T. gondii. Significant differences were observed regarding age (p = 0.0000004). Thus, anti-T. gondii were found in the animals studied, and it may be a source of infection for the human population.