Anti-N-methyl-D-aspartate receptor encephalitis: a common autoimmune disease?

Area of Science:

• Neurology
• Immunology
• Infectious Diseases

Background:

• Autoimmune encephalitis targeting N-methyl-D-aspartate receptors (NMDAR) presents with diverse neurological and psychiatric symptoms.
• First described in 2007, NMDAR encephalitis is increasingly linked to infections, particularly viral.
• Ovarian teratomas are a known association, but viral triggers are a growing area of research.

Purpose of the Study:

• To report a unique case of biphasic illness involving Murray Valley encephalitis and subsequent NMDAR antibodies.
• To review the literature on flavivirus infections associated with anti-NMDAR encephalitis.
• To enhance understanding of the interplay between viral infections and autoimmune neurological disorders.

Main Methods:

• Case report of a patient with biphasic illness.
• Literature review of flavivirus infections and anti-NMDAR encephalitis.
• Clinical and immunological assessment of the patient.

Main Results:

• A patient with Murray Valley encephalitis developed NMDAR antibodies, confirming a link between this flavivirus and autoimmune encephalitis.
• The literature review identified other flaviviruses associated with anti-NMDAR encephalitis.
• The case highlights a potential biphasic presentation of NMDAR encephalitis triggered by viral infection.

Conclusions:

• Murray Valley encephalitis can be a trigger for NMDAR autoimmune encephalitis.
• Flavivirus infections represent an important category of infectious triggers for NMDAR encephalitis.
• Further research is warranted to elucidate the mechanisms linking flaviviruses to NMDAR autoimmunity.