LEPTOSPIROSIS: LONG-TERM SURVEILLANCE ON AN ILLINOIS FARM1

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Abstract
Schnurrenberger, P. R. (Illinois Dept. Public Health, Springfield, III. 62706), L. E. Hanson and R. J. Martin. Leptospirosis: long-term surveillance on an Illinois farm. Amer, J. Epid., 1970, 92: 223–239.—The wild and domestic animals on an Illinois farm were studied for leptospiral infections over a 4-year span. During this period L. hardjo was isolated from 6 beef cattle, and L. icterohemorrhagiae was isolated from 3 dairy cattle and 2 swine. There was serologic evidence that beef and dairy cattle became infected with L. grippotyphosa during the four years. L. ballum was isolated from 24 house mice, 8 Norway rats, 1 opposum and 1 shrew; L. grippotyphosa from 1 raccoon; and L. icterohemorrhagiae from 198 Norway rats and 4 raccoons. L. icterohemorrhagiae also was isolated from the fetuses of 7 of 21 infected pregnant Norway rats. In 1968 L. icterohemorrhagiae was isolated from 19 of 20 rats collected from the hog fattening area. This was the year the same serotype was isolated from the swine and dairy cattle. The vehicle of transmission appeared to be water overflowing from hog watering tanks. Twelve isolates were made from water but none was identifiable as a known pathogenic serotype. There were no reactive sera among 150 persons tested.

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