Blood samples were collected from 89 cats to assess the prevalence of IgG antibodies against Toxoplasma gondii by indirect immunofluorescence (IIF) and the possible risk factors associated with feline Toxoplasma gondii infection. An epidemiological questionnaire was developed and implemented for owners of domestic cats domiciled in Rio Branco, Acre. The results were statistically evaluated with the odds ratio and chi-square tests, considering the significance level of 5%. Of 89 animals' samples, 22 had antibodies against Toxoplasma gondii. Among the 22 reactive animals, 15 (68.19%) were female, 15 (68.19%) were less than one year old and 20 (90%) were cross breed. Concerning risk factors, there was no difference (p > 0.05) between the variables evaluated by the chi-square test. Moreover, 16 (72%) cats were fed a mixed diet, 20 (90%) of the cats had hunting habits, 18 (81%) had contact with animals of another species, 11 (50%) had access to the street, and 21 (95%) lived in homes that had areas of grass or dirt. In conclusion, the prevalence of anti-Toxoplasma gondii in domestic cats was 24.7%, and there were no significant risk factors for feline toxoplasmosis in the municipality of Rio Branco, Acre. Key words: Toxoplasmosis, feline, seroprevalence
ResumoCom o objetivo de avaliar a ocorrência de anticorpos IgG contra Toxoplasma gondii por meio de Imunofluorescência Indireta (RIFI) e associar com os possíveis fatores de risco para a enfermidade, foram colhidas amostras de sangue da veia jugular de 89 gatos domiciliados, na cidade de Rio Branco, Acre após a realização de inquérito epidemiológico pautado nos principais fatores de risco para a presença de anticorpos. Os resultados encontrados foram avaliados estatisticamente com o teste de razão de chances (Odds ratio) e qui quadrado, considerando-se o nível de significância de 5%. 11 (50%) tinham livre acesso à rua e 21 (95%) habitavam casas que possuíam áreas de grama ou terra. Conclui-se que na cidade do Acre, Rio Branco, a prevalência de anticorpos (IgG) para anti-Toxoplasma gondii nos felinos domiciliados foi de 24,7%, e que os fatores de risco não foram significantes.