The incidence of early infectious syphilis in Singapore rose from 8.7 per 100,000 in 1980 to 25 per 100,000 in 1984. In this epidemiological study of 100 patients with early syphilis, 70 were men, the mean age was 31.7 (range 17 to 68) years, 25 patients had primary syphilis, 47 secondary syphilis, and the remaining 28 had early latent syphilis. Female prostitutes were cited as sources of infection by 46 and homosexual contacts by 11. Reduced herd immunity, decreased use of penicillin, greater population movement, and decreased surveillance and awareness have contributed to this rise in infectious syphilis.
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