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.
1 Both encephalitis and meningitis can be caused by bacteria or viruses, and rarely a fungus, or be noninfectious. 2  Headache and fever are the most common symptoms of encephalitis and meningitis.