Part I Encephalitis.- Measles Virus Infection and Subacute Sclerosing Panencephalitis.- Epstein-Barr Virus and Cytomegalovirus Infections.- Herpes Simplex Virus Meningoencephalitis.- Progressive Multifocal Leukoencephalopathy.- Varicella-Zoster Virus Infections.- Part II Meningitis.- Enterovirus Infections.- Part III Retroviruses.- Human Immunodeficiency Virus Infection / AIDS.- Human T-cell Lymphotropic Virus Type 1 Infection.- Part IV Viral Zoonoses.- Rabies.- West Nile Virus Infection.- Japanese Encephalitis Virus Infection.- Chikungunya Virus Infection.- Nipah Virus Infection.- Viral Hemorrhagic Fevers.- Part V Unconventional Agents.- Prion Diseases.