Endemic syphilis in the Karoo.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D044383:Black People; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D013019:South Africa; D013587:Syphilis / Q000453:epidemiology* / Q000235:genetics; D013588:Syphilis Serodiagnosis; D014211:Treponemal Infections / Q000453:epidemiology*