Abstract
Conclusions
A comparative study has been made between the infectivity of 2 groups of Treponema pallidum, 9 new and 4 older strains. The mean of incubation of the newer group varied from 30 to 44 days, while that of the older group varied from 24.75 to 33.85 days. Statistically, both groups appeared to be homogeneous in themselves and the incidence of takes for the newer strains was 64.9%, while that of the older strains 90.6%, a difference of 25.7%. These findings indicate adaptation of the organism to its new host and should be considered in all work in experimental syphilis.
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