The cytokines IL-6, IL-10, IL-12, IL-17, TNF-α and IFN-γ were evaluated in the Cerebrospinal fluid (CSF) of patients with meningoencephalitis with and without viral infections as well as in control CSF samples using the cytometric bead array (CBA – BD biosciences). The gene discussed is IFNG; the disease is meningoencephalitis.