Abstract
Summary 1. Epidemiological data suggest that yaws protects against syphilis. 2. The recent demonstration of a true immunity in syphilis throws new light on this question. 3. Experimentally, a partial immunity against syphilis can be demonstrated in rabbits which have been infected a long time with yaws and cured by arsphenamine. 4. The subject of strains must be taken in account, both in yaws and syphilis.

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