Abstract
Summary
A complement-fixing reaction for “Q’ fever which is specific among the rickettsial diseases is described. Yolk sac antigen was superior to mouse spleen antigen in tests with human sera. The test was shown to have a good degree of sensitivity and it appeared 9 to 13 days after onset of the disease and persisted for at least 305 days. The indications are that the test is of value for diagnosis and that it affords evidence of immunity.
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