There has always been a feeling of so much repulsion with regard to syphilitic lesions of any stage that this of itself has been sufficient to make people take precautions against possible inoculation. There has been a definite persuasion in the minds of most physicians that the later lesions of syphilis, that is, those occurring more than two years after the initial lesion, are not capable of conveying the disease. This has been considered particularly true with regard to the gummatous lesions which occur after the disease has run a course of several years. It is not always easy to distinguish absolutely between secondary and tertiary lesions, but gummata have always been considered as belonging to the third stage, and as being essentially non-contagious. In recent years some doubts of this have been expressed, and now it would seem that a sufficient number of cases have been collected to prove
CONTAGIOUSNESS OF LATE SYPHILIS. JAMA. 1906;XLVII(17):1380–1381. doi:10.1001/jama.1906.02520170044006
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