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Rickettsia Diaporica and American Q Fever¹

Davis and Cox (1) have reported the isolation of a filter-passing, infectious agent from Dermacentor andersoni collected near Nine Mile Creek, Montana; Parker and Davis (2) its experimental transmission by the tick; Cox (3) has reported its riokettsia-like nature and Dyer (4) the occurrence of the infection in a laboratory worker. More recently Cox (5) has suggested the name Rickettsia diaporica for this organism and Dyer (6) has pointed out its close relationship to that of Q fever of Australia. For lack of a better term the name "Nine Mile" fever was temporarily used to designate the disease (7, 12). We now feel that the name American Q fever is preferable.

Cross Immunity Tests

Tests carried out with guinea pigs have shown that American Q fever shows no cross immunity with Rocky Mountain spotted fever, Brazilian spotted fever, boutonneuse fever or epidemic and endemic typhus.

Received April 20, 1940.
¹ Contribution from the Rocky Mountain Laboratory (Hamilton, Montana), Division of Infectious Diseases, National Institute of Health. Presented before the section on Rickettsial Diseases of the Third International Congress for Microbiology, New York, September 4, 1939.