The seroprevalence of Toxoplasma gondii infection in Tibetan sheep was surveyed in Qinghai Province, northwestern China, in May and June 2010. In total, 580 serum samples was collected from 6 counties, and antibodies to T. gondii were detected by indirect hemagglutination (IHA) test. Antibodies to T. gondii were found in 29.8% (173/580); regional differences showed the highest prevalences in Nangqian County (39.4%) and Zaduo County (48.7%). The results of the present study indicate that infection with T. gondii in sheep is widely spread in China, including Tibetan sheep in Qinghai Province, and is a potential public health concern.

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