Abstract
An epidemiologic study of Q fever, as made in the endemic area of southern California, suggests three modes in which the infection may be spread: ( a ) occupation in dairy or livestock industries, ( b ) use of raw milk and ( c ) residence within 1/4 mile of places where cattle are maintained or beef is processed. 1 It has been estimated that more than 10 per cent of the cattle in this region are infected with Coxiella burnetii, the etiologic agent of Q fever, and that more than 50 per cent of the raw milk produced in this area is infective for guinea pigs. 2 Cases of Q fever have occurred among slaughterhouse workers 3 and laboratory technicians. 4 C. burnetii has been found in ticks, 5 and 1 case has been reported in which the infection was probably caused by the crushing of ticks between the fingers. 6 It has been stated
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