seroprevalence in water buffaloes in Guangxi, China.

is an important obligate intracellular apicomplexan parasite that causes spontaneous abortions in cattle and leads to huge economic losses to the farming industry. Although a high prevalence of infection has been reported in Asia, data on the prevalence of water buffaloes in China remain unclear. To understand the seroprevalence of infection in water buffaloes and its definitive host dogs in China, a total of 987 water buffalo sera from Guangxi Province were tested using an indirect enzyme-linked immunosorbent assay. We obtained an overall seroprevalence of 50.9% (502/987) for water buffalo samples. And the positive rate was higher in border cities (56.8%, 425/748) than in central cities (32.3%, 77/239). We further tested 240 serum samples from dogs in Guangxi and found an overall prevalence of 57.9% (139/240). The high prevalence of infection in both dogs and water buffaloes was first reported in southern China, and these data will surely contribute to the prevention and control of the disease.