Leptospirosis can be caused by infection with a number of different serovars of the bacteria Leptospira interrogans. In general infection with a host adapted strain results in subclinical infection, intermittent shedding of the organism and the animal acts as a reservoir for infection. Infection with non host adapted strains results in clinical disease.
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**Dogs and cats
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***Serovars ''canicola'' and ''icterohaemorrhagica'' cause leptospirosis in dogs, but are vaccinated against
***Serovars ''canicola'' and ''icterohaemorrhagica'' cause leptospirosis in dogs, but are vaccinated against
***Serovars ''pomona'' and ''grippotyphosa'' are becoming important
***Serovars ''pomona'' and ''grippotyphosa'' are becoming important