What causes encephalitis?

What causes encephalitis?

The type of encephalitis you experience depends on the cause. And there are many causes, including:

• Viruses: Infections from herpes, enteroviruses, human immunodeficiency virus (HIV), West Nile and tick-borne viruses lead to viral encephalitis. This is the most common cause.
• Problem with the immune system: The immune system can mistakenly attack the brain, causing autoimmune encephalitis.
• Bacteria and parasites: On rare occasions, these germs can cause bacterial encephalitis.