Abstract
Conclusion
Serological studies on convalescent specimens from cases of Rocky Mountain spotted fever show the presence of epidemic and murine agglutinins and epidemic neutralizing antibodies although there is no evidence of cross complement fixation. This evidence fits in with the observations of Castaneda and Silva and those of Parker, and indicates that there is a serologic relationship between epidemic typhus fever and Rocky Mountain spotted fever. The data presented in this paper must be considered in evaluating the results obtained with rickettsial agglutination or the neutralizing antibody when these tests are used as diagnostic procedures.
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