Detection of DNA closely related to 'Candidatus Rickettsia principis' in Haemaphysalis danieli recovered from cattle in Xinjiang Uygur Autonomous Region Area, China.

Tick DNA samples from cattle in Xinjiang Uygur Autonomous Region Area, China, were examined for Rickettsia infection by citrate synthase gene-based PCR and sequencing. Four positive samples were detected from Haemaphysalis danieli and high levels of similarity were found with recently detected 'Candidatus Rickettsia principis.'