Case 3-2019: A 70-Year-Old Woman with Fever, Headache, and Progressive Encephalopathy.

The article discusses the case of a patient diagnosed with Powasan virus encephalitis. Topics discussed include the patient's clinical presentation of fever, headache and progressive encephalopathy, differential diagnosis which include bacterial, fungal and arthropod-borne virus infections, and the results of laboratory tests, computed tomography and magnetic resonance imaging (MRI) of the head. Also discussed are the characteristics of Powassan flavivirus and the treatment of the patient.