Abstract
Tick-borne spotted fever group (SFG) rickettsioses are caused by obligate intracellular Gram-negative bacteria belonging to the genus Rickettsia. Although some rickettsias have been known as human pathogens since the beginning of the century, tick-borne SFG rickettsioses are also recognised as important emerging zoonoses worldwide [1]. Few SFG rickettsiae have been described in China: Rickettsia sibirica sibirica, the agent of the North Asian tick typhus (also known in the former USSR as Siberian tick typhus); Rickettsia sibirica mongolitimonae, the agent of the so-called lymphagitis associated rickettsiosis; and an emerging pathogen, R. heilongjiangensis [1,2]. In this study, in an effort to identify the possible aetiologic agents and vectors for rickettsiosis affecting humans in China, we analysed ticks collected in China for evidence of rickettsial infection.
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