Occurrence of Toxoplasma gondii and other gastrointestinal parasites in free-roaming cats from the Rio de Janeiro zoo.

This communication aimed to determine the frequency of infection by T. gondii and other gastrointestinal parasites in free-living cats captured in BioParque do Rio (Fundação RioZoo), Brazil. To this end, 58 blood and 51 fecal samples were collected from 68 cats from July 2019 to September 2020. The serum obtained was analyzed by indirect fluorescent antibody test for anti-T. gondii IgG. Fecal samples were examined by microscopic parasitological techniques. Of the total, 10.3% of the animals presented anti-T. gondii IgG. Parasitic structures were observed in 39.2% of the fecal samples. Hookworms were the most detected parasites (19.6%) followed by Cystoisospora sp. (11.7%), Dipylidium caninum (7.8%) and Toxocara cati (3.9%). These results indicated the exposure of this population of stray cats to potentially zoonotic parasites, which in addition to causing possible damage to domestic and wild animal health, also pose risks to public health.