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.
When certain parts of the brain are infected in encephalitis the symptoms vary depending on what parts of the body that portion of the brain controls. Forebrain encephalitis creates blindness, behavior changes, seizures, mental depression and a peculiar symptom where the dog walks in circles.