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a 







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f 



Fig. 67. (A) Endemic typhus rickettsiae from yolk sac smear X 1500. 

 (B) "Q" fever rickettsiae cultivated in chick egg X 1500. (Courtesy of 

 the Rocky Mountain Laboratory, U.S. Public Health Service, Hamilton, 

 Montana. Photographs by N. J. Krawis.) 



381 



