Leptospirosis is a bacterial disease of animals and man and is caused by bacteria in the genus Leptospira and primarily in the species Leptospira interrogans. The primary reservoir of the bacteria is rodents. However, infected domestic animals such as cattle, sheep, goats, pigs, dogs, and cats can pose an additional threat to humans. Humans generally become infected by direct contact with infected animals or from exposure to contaminated water. Leptospirosis can be an occupational disease risk for individuals who work with animals or who have exposure to contaminated soil or water. At least one large leptospirosis outbreak in the United States has been linked to the recreational use of a lake.
During 1999-2003, four cases of leptospirosis were reported in Indiana, with one case reported in 2003.
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