CD40LG and Japanese encephalitis: There were two cases (2.4 %) of confirmed neurosyphilis, three cases (3.6 %) of probable cerebral toxoplasmosis in HIV patients, three patients with enterovirus infection and one case (1.2 %) each of confirmed Japanese encephalitis (CSF Japanese encephalitis IgM positive) and Epstein-Barr virus meningitis.