[Comparative value of complement fixation and indirect immunofluorescence reactions for the detection of Q fever]

1 052 serum samples from 1 013 persons living in rural areas, were tested by IF and CF; with the IF-test, 4% of them were sero-positive (titer greater than or equal to: 20). IF-tests are eightfold more sensitive than CF tests and have at least the same specificity. The results of two (commercial) Coxiella burnetii phase II antigens were compared.