File:Preventive medicine and hygiene (1917) (14785114255).jpg

Identifier: preventivemedici1917rose (find matches)
Title: Preventive medicine and hygiene
Year: 1917 (1910s)
Authors: Rosenau, M. J. (Milton Joseph), 1869-1946 Whipple, George Chandler, 1866-1924 Trask, John W. (John William), b. 1877 Salmon, Thomas William
Subjects: Hygiene Public Health Sanitation Military Hygiene
Publisher: New York, London, D. Appleton
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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larvae andthe remainder for the development of the parasite within the host, ROCKY MOUNTAIN SPOTTED FEVER This disease, also called tick fever and spotted fever, is an interest-ing infection which occurs chiefly in the Bitter Eoot Valley of Montana,centering around Missoula. Cases also occur in the neighboring statesof Idaho and Wyoming, also Washington and California. The symptomsclosely resemble those of typhus fever, including a petechial eruption.Anderson and Goldberger have shown that typhus fever of Mexico, calledtabardillo, is not transmissible to guinea-pigs, while Eicketts and alsoKing independently demonstrated that some of the infected blood of acase of Eocky Mountain fever injected into a guinea-pig will reproduce ^ These various names are given for tlie reas(in that they are all found in theliterature. 290 mSECT-BOENE DISEASES tlie chief features of this disease. The two diseases are^, therefore,distinct. AVilson and Chowning first suggested that the tick acts as the car-
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FiG. 47.—Rocky Mountain Spotted Fevek Tick. (Dermacentor venustus). 1, Adult female, unengorged, dorsal view; 2, Adult male, dorsal view; 3, Adult female,unengorged, ventral view; 4, Adult male, ventral view; 5, Adult female in act of de-positing eggs. rier of Eocky IMountain spotted fever. This was proven by Eicketts in1906, who shoMTd that the particular tick is Dermacentor occiden-talis (now venustus). The infection may be transmitted by the larva. TICKS 291 the nymph, and both the adult male and female ticks. The infectionis also transmitted hereditarily through the ticks to their larvae. Thedisease has been transmitted by the tick from man to monkey and theguinea-pig, and also from monkey to monkey and from guinea-pig toguinea-pig. A few infected ticks have actually been found by Kickettsin nature. Maver ^ has proved by experiment that different species of ticks col-lected from various regions (Dermacentor marginatus (Utah), Amhly-omma americanus Unnaeus (Missouri), and Dermace

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