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In both men and women:
Another important factor that affects risk of spreading syphilis is how long an infected partner has had syphilis.
Anyone exposed to an infected partner can get an STD in the mouth, throat, genitals, or rectum.
The symptoms I am referring to include sore throat, mouth or throat blisters or ulcers in the mouth or throat.
Many experts say oral sex is not safe sex.
American Journal of Epidemiology ;
Incidence and risk factors for urethral and anal gonorrhoea and chlamydia in a cohort of HIV-negative homosexual men: