Influenza A presenting as viral encephalitis in an adult.

In adults, influenza A may be accompanied by a variety of neurological findings. Influenza-associated encephalitis (IAE) is rare in adults, and usually follows influenza A after 2 days. In patients with influenza who later develop encephalitis, the diagnosis of IAE is relatively straightforward. We present a rare case of IAE in an adult who presented with viral encephalitis that was later attributed to antecedent influenza A.