| first isolation of rickettsia helvetica from ixodes ricinus ticks in france. | two rickettsial isolates recovered from ixodes ricinus ticks in puy-de-dôme (central france) were characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, western blot immunoassay, restriction fragment length polymorphism analysis, and sequencing of a portion of the citrate-synthase gene. by these methods, the isolates appeared to be identical to a member of the spotted fever group rickettsiae, rickettsia helvetica. this first isolation of rickettsia helvetica in france has ep ... | 1998 | 9629973 |