isolation of coxiella burnetii and of an unknown rickettsial organism from ixodes ricinus ticks collected in austria.two strains of coxiella burnetii and two strains of an unidentified rickettsial organism were isolated for the first time from ixodes ricinus ticks collected in the alpine region of tirol, austria. the c. burnetii strains belong to the group of agents causing acute forms of q fever. the other two strains of isolated rickettsial agent share some antigenic epitopes with c. burnetii and r. prowazekii but they differ from them by their high sensitivity to freezing and refreezing and by poor multipli ...19947545588
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