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.
Without treatment, secondary syphilis turns into late syphilis (also called latent or tertiary syphilis). This can develop from two to thirty years after infection. At this stage, no symptoms are present and the infection can only be detected with blood tests. However, the disease continues to cause damage.