If you need to define a word in your paper, the definition usually comes from a glossary in the back of a book. To properly attribute this definition you will need to cite it according to the American Psychological Association (APA) style guidelines.
Encephalitis is inflammation of the brain tissue. It's most often caused by viral infections. In some cases, bacterial infections can also cause encephalitis.
A. Viral encephalitis is an infection of the brain caused by a virus. In some cases, it can cause back pain. Symptoms include headache, fever, irritability, decreased awareness, possible seizures and even focal brain dysfunction.