What is the seasonal variation in incidence for leptospirosis?

Updated: Jul 08, 2021
  • Author: Sandra G Gompf, MD, FACP, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Leptospirosis has a seasonal incidence. Most cases occur during the rainy season in the tropics and during the late summer or early fall in Western countries, when the soil is moist and alkaline. The leptospires from infected animals survive best in fresh water, damp alkaline soil, vegetation, and mud with temperatures higher than 22°C.


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