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Rickettsia helvetica
''Rickettsia helvetica'' is a bacterium found in ''Dermacentor reticulatus'' and other ticks which has been implicated as a suspected but unconfirmed human pathogen. First recognized in 1979 in ''Ixodes ricinus'' ticks in Switzerland (hence the designation ''helvetica'') as a new member of the spotted fever group of ''Rickettsia'', the ''Rickettsia helvetica'' bacterium was eventually isolated in 1993. Although ''R. helvetica'' was initially thought to be harmless in humans and many animal species, some individual case reports suggest that it may be capable of causing a non-specific fever in humans.〔〔 In 1997 a man living in eastern France seroconverted to ''Rickettsia'' 4 weeks after onset of an unexplained febrile illness. In 2010, a case report indicated that tick-borne ''R. helvetica'' can also cause meningitis in humans.
Molecular evidence suggests that in Croatia as many as 10% of ''Dermacentor reticulatus'' ticks are infected with ''R. helvetica''.
== Signs and symptoms ==
Erythema migrans or rash was observed at all combinations of seroreactivity, with symptoms including fever, muscle pain, headache and respiratory problems
The spots (erythema migrans) are described as red spots, much lesser in size than those seen in lyme disease, but sometimes there are no spots at all according to http://www.gp.se/nyheter/sverige/1.1067910-fastingar-sprider-flacktyfus (Interview Kenneth Nilsson, Swedish co-author of previous citation).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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