Articles having appeared recently in The Journal and the Public Health Reports describing the leprosy-like disease observed among the rats in San Francisco and Oakland, it seems advisable to report the cases which I have found in this city during the past month.
Previous to that time I had not been searching for them, and although a number of "mangy" looking rodents were brought to the laboratory no special examination was made of their skins, and I feel certain that a number of cases of the disease passed through my hands without recognition.
For the past month, however, I have been keeping a careful lookout for them, and out of some 2,780 rats examined have found fourteen which presented unmistakable cases of leprosy. Of this number ten were males and four females; all were of the species Mus Decumanus (or Norvegicus). A few others, I believe, may have had the
WALKER A. A REPORT OF SOME CASES OF RAT LEPROSY. JAMA. 1908;LI(14):1153–1154. doi:10.1001/jama.1908.25410140035004c
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