P. W. C.
Two types of rickettsial infections are associated with so high a mortality and (at least, at some times) so high a morbidity that effective preventive measures are of great practical importance. These are epidemic ("Old World") typhus fever, and the Rocky Mountain spotted fever.
Spotted fever is conveyed to man by the bite of the wood tick. Man does not constitute an essential link in the life cycle of the infection. The natural reservoir of the virus is the tick, in which it passes from one generation to the next through the egg, and probably also various wild mammals on
P. W. C.. VACCINATION AGAINST RICKETTSIAL INFECTIONS. Ann Intern Med. 1942;16:366–369. doi: 10.7326/0003-4819-16-2-366
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Published: Ann Intern Med. 1942;16(2):366-369.
Infectious Disease, Vaccines/Immunization.
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