Viral infections of the leptomeninges and subarachnoid space. togaviridae infections; flaviviridae infections; rubella; bunyaviridae infections; orbivirus infections; picornaviridae infections; orthomyxoviridae infections; rhabdoviridae infections; arenaviridae infections; herpesviridae infections; adenoviridae infections; jc virus infections; and retroviridae infections may cause this form of meningitis. Clinical manifestations include fever, headache, neck pain, vomiting, photophobia, and signs of meningeal irritation. (From Joynt, Clinical neurology, 1996, Ch26, pp1-3)