Abstract:In order to explore the epidemic situation of eperythrozoon in Tuoketuo County, Hohhot City, Inner Mongolia, the case of an East Friesian dairy sheep farm in Tuoketuo County, Hohhot was received. In the past week or more, the dairy sheep in the farm had symptoms such as increased body temperature, depression, paralysis, loss of appetite or abandonment. There were cases of rapid death within 1~2 days of symptoms. There were also cases of no improvement or death after 1 week of treatment with antibiotic gentamicin sulfate-penicillin combined with rehydration. The total number of deaths exceeded 8, and more than 10 similar symptoms were still being treated. Through on site autopsy, enclosure environment investigation, sample laboratory test, combined with clinical diagnosis and treatment, the epidemic was confirmed as eperythrozoonosis in dairy sheep, and eperythrozoon ovis infection also existed in the surrounding sheep farms (households ). It shows that eperythrozoon ovis is endemic in Togtoh County.