text: <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.
option_0: Neurosyphilis
option_1: Syphilis
option_2: Mumps
option_3: Chickenpox
option_4: Leprosy
option_5: Smallpox
option_6: Rubella
option_7: Rickettsialpox