Abstract
Summary 1. Guinea pigs actively immunized against the Boston strain of L. icterohaemorrhagiae are immune against Type A of the Akiyami strain of leptospira. 2. Guinea pigs actively immunized against Type A of the Akiyami strain of leptospira are immune against the Boston strain of L. icterohaemorrhagiae. 3. These two strains are indistinguishable by the cross immunity tests.

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