5-FU injection and topical even in small doses cause both acute central nervous system (CNS) damage and progressively worsening delayed degeneration of the CNS in mice. This latter effect is caused by 5-FU-induced damage to the oligodendrocytes that produce the insulating myelin sheaths.
Home > Sexually transmitted infections > Syphilis > After treatment for syphilis. It is strongly advised that you do not have any sexual intercourse; including vaginal; anal or oral sex until you and your partner(s) have both finished the treatment and any follow-up treatment.
All signs and symptoms of the second stage of syphilis will disappear without treatment between three weeks and nine months, but the infection will still be present in the body. Latent Syphilis. The latent stage of syphilis, which occurs after the symptoms of secondary syphilis have disappeared, can last anywhere from a few years to up to 50 years. There are no symptoms in this stage and, after about two years, you may cease to be contagious.