Leptospira interrogans serotypes ballum and grippotyphosa were isolated from muskrats (Ondatra zibethicus) taken in central Illinois. This represents the first reported isolation of ballum and the first United States record of grippotyphosa from this species.
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1 January 1972
Leptospira interrogans SEROTYPES Ballum AND Grippotyphosa ISOLATED FROM THE MUSKRAT
JOHN R. PAUL,
LYLE E. HANSON,
PAUL R. SCHNURRENBERGER,
RUSSELL J. MARTIN