Abstract
Wild rats (Rattus norvegicus) trapped in and about Washington were found to be infected with Leptospira icterohaemorrhagiae. The incidence was higher among specimens > 20 cm. long. The most reliable methods for the detection of leptospirosis among rats were serologic examinations of serum and study of Levaditi-stained sections of kidney. The agglutination test should be used whenever surveys of the incidence of murine leptospirosis are made.

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