[Differences in sensitivity of passive hemagglutination and passive hemolysis reactions in serological diagnosis of rickettsial infections].

We compared the sensitivity of indirect hemagglutination and indirect hemolysis tests by detection of antibodies in sera of man, rabbits and sheep after infection with R. slovaca, R. sibirica and C. burnetii. We found that the titres of antibodies in indirect hemolysis are 4 times higher than in indirect hemagglutination namely with the sera of man, rabbits and sheep. This method can be recommended for diagnoses of rickettsiae of Spotted fever group.