Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs MeningoencephalitisUpdated: 2019-11-16OverviewMeningoencephalitis is a condition that's usually caused by a virus, bacterium, parasite, or other microorganism. Examples include West Nile virus, mumps, or tuberculosis. SymptomsSymptoms vary depending on the cause. They may include fever, confusion, vomiting or seizures.Left untreated, meningoencephalitis can lead to death. TreatmentsTreatment may include antibiotics, antivirals and supportive care, depending on the origin of the disease. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use