<unk>  refers to a site of infection involving the central nervous system (CNS). It may occur at any stage of syphilis. Before the advent of antibiotics, it was typically seen in 25-35% of patients with syphilis.<unk>  is now most common in patients with HIV infection. Reports of<unk>  in HIV-infected persons are similar to cases reported before the HIV pandemic. The precise extent and significance of neurologic involvement in HIV-infected patients with syphilis, reflected by either laboratory or clinical criteria, have not been well characterized. Furthermore, the alteration of host immunosuppression by antiretroviral therapy in recent years has further complicated such characterization.
Neurosyphilis
Syphilis
Mumps
Chickenpox
Leprosy
Smallpox
Rubella
Rickettsialpox