JAMA. 1931;96(14):1146-1147. doi:10.1001/jama.1931.02720400044014.
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For years a mild form of typhus fever has been endemic in parts of the Eastern states. More recently the endemic area seems to have been extended especially toward the South. For the past year the United States Public Health Service,1 has been making an epidemiologic investigation of endemic typhus in this area. The investigators visited most of the patients and obtained information about others from the attending physicians. It early became evident that many of the cases did not correspond with the picture of endemic typhus. They were much more severe. Rumreich, Dyer and Badger,2 who analyzed a hundred of the cases under investigation, had no difficulty in separating them into two groups. One group comprised fifty cases that were clearly endemic typhus fever; the other group of fifty cases were clinically indistinguishable from Rocky Mountain spotted fever. The patients in the first group were mostly persons


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