Serologic and immunologic responses in chronic fatigue syndrome with emphasis on the Epstein-Barr virus.
Jones, J F·Reviews of infectious diseases·1991
This review examined whether ME/CFS is connected to Epstein-Barr virus (EBV), the virus that causes mono. Researchers found that people with ME/CFS had higher levels of antibodies to EBV compared to healthy people, but this doesn't prove the virus causes the disease. They also found that immune cells called natural killer cells—which help fight infections—work differently in ME/CFS patients, though the findings varied between studies.