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Another cause of encephalitis under study is encephalitis believed to be caused by an autoantibody attack on subunits of brain N-methyl-d-aspartate (NMDA) glutamate receptors. The autoantibodies are termed anti-NMDA receptor antibodies, and the disease is termed NMDA receptor encephalitis, first identified in 2007.
Cause of Encephalitis. In the United States, encephalitis causes can include enteroviruses, herpes simplex virus types 1 and 2, and arboviruses. Lyme disease can also be a cause of the disease. In the case of primary encephalitis, it is a direct viral infection of the spinal cord and brain.