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Experimental Immunity in Syphilis and Yaws¹

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.

¹ Read in part at the annual meeting of the American Society for Experimental Pathology, December 29 to 31, 1924, Washington, D. C., and the twenty-first annual meeting of the American Society of Tropical Medicine, May 5 and 6, 1925, Washington, D. C.