Genotyping of Toxoplasma gondii strains isolated from dogs with neurological signs

From 111 dogs with neurological signs admitted in this research in a 22-month period, brain samples of 34 animals were inoculated in mice in order to isolate Toxoplasma gondii. From these 34 dogs, 9 strains of T. gondii were isolated and the genetic characterization performed by restriction analysis (RFLP) of the SAG-2 gene. RFLP analysis showed that four of them were classified as Type I, and five as Type III. The present report is the first description of genotyping of T. gondii isolated from brain samples of naturally infected dogs, in Brazil.