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Background   Toxoplasma gondii  is an obligate, intracellular protozoan that infects almost all warm-blooded animals, including humans, domesticated and wild animals. Recent studies of  Toxoplasma gondii  isolates from animals in different regions of China have shown a limited genetic diversity with the dominance of the ToxoDB PCR-RFLP genotype #9 named as “Chinese 1”. However, there is not much published information regarding its prevalence in domestic animals from Guizhou province, a subtropical region in Southwest China. The objectives of this study were to determine seroprevalence and genetic diversity of  T .gondii  in pigs, dogs and cats in Guizhou province, Southwest China.    Findings  The anti- T. gondii  IgG were detected in 70.0%(49/70) pigs, 20.56%(22/107) dogs and 63.16(12/19) cats. The anti- T. gondii  IgM were found in 0.93%(1/107) dogs, 21.53%(4/19) cats, but not in pigs. In addition, the toxoplasma circulating antigen (CAG) were detected in 16.9%18/70)pigs, 13.1% (14/107) dogs and 10.5%(2/19) cats. The  T. gondii  DNA were detected in 31.5%(22/70) pigs, 3.7%(4/107) dogs and 52.63%(10/19) cats. Five  T. gondii  isolates were obtained(3 from pigs and 2 from cats). The genotype of these five isolates belonged to the predominant genotype “Chinese 1”.    Conclusions  The high prevalence of  T. gondii  infection in pigs,cats and dogs indicated that the  T. gondii  infection is common in Guizhou province. Additionally, the  T. gondii  genotype “Chinese 1” was dominant in Southwest China.    Electronic supplementary material  The online version of this article (doi:10.1186/s13071-015-0809-2) contains supplementary material, which is available to authorized users.

Seroprevalence and genotype of Toxoplasma gondii in pigs, dogs and cats from Guizhou province, Southwest China