Meningoencephalitis, also called herpes meningoencephalitis, is an infection or inflammation of the meninges (membranes surrounding the brain) and the brain. The symptoms include personality alterations, thinking difficulties, odd behavior, fever, light sensitivity, seizure, stiff neck, loss of consciousness, and headache. This is caused by certain bacterial, viral, fungal, or protozoan pathogens. These pathogens may be transmitted through kissing, sex, and blood transfusion. Generally, the treatment is an intravenous antiviral medication which is usually taken for 2 weeks.