Use viral meningitis be treated as an outpatient, be done if viral meningitis does not improve within 48., and key features of Powassan encephalitis to frame the working diagnosis and next step; let it determine what to check next and how closely to follow the patient. Make be done if viral meningitis does not improve within 48. the checkpoint that determines whether you escalate testing, narrow the differential, or change treatment.

Neuroimaging often highlights structural abnormalities in the cerebellum or deep gray matter; Systemic viremia can completely clear before neurological symptoms even start—which is a classic problem with West Nile; Starts with a fever and altered mental status, and it carries a high rate of long-term morbidity; Tick-borne viral encephalitis that causes a severe neurological syndrome; If they aren't turning the corner within 48 hours, you need to bring them back in for a full re-evaluation, including an MRI and a repeat lumbar puncture