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Rickettsial and Serologic Evidence for Prevalent Spotted Fever Rickettsiosis in Inner Mongolia

Fan Ming-Yuan^*, David H. Walker, Liu Qing-Huai, Li Han^*, Bai Hai-Chun, Zhang Jia-Ke^*, Brenda Lenz AND Cai Hong^*

^* Department of Rickettsiology, Institute of Epidemiology and Microbiology, Chinese Academy of Preventive Medicine, Beijing, People's Republic of China,
Department of Pathology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514,
Inner Mongolia Anti-Epidemic Station, Huhehot, Inner Mongolia, People's Republic of China,
and Hulunbeier District Anti-Epidemic Station, Hailaer, Inner Mongolia, People's Republic of China

A field study in northeastern Inner Mongolia, People's Republic of China, in June of 1985 demonstrated a spotted fever group rickettsiosis. Two strains of spotted fever group rickettsiae were isolated. One strain was obtained from the blood of a patient with an eschar, regional lymphadenopathy, and history of a recent tick bite. The other strain originated from ova of ticks, Dermacentor nuttalli. These represent the second isolate of a spotted fever group rickettsia from a human and the first isolate from tick ova in the People's Republic of China. Antibodies to these rickettsiae were demonstrated by indirect immunofluorescence in the sera of 4% of healthy children and 34% of healthy human adults, in 58% of sheep, and in 76% of cattle in the same location. Hemolymph test revealed rickettsiae in 6 of 36 D. nuttalli examined.

Accepted for publication October 27, 1986.