- "The study asked 1,546 people to list any illnesses or unusual health
issues that they experienced before becoming sick with CFIDS. Respiratory
tract infections were the most common (24.3%), followed by flu-like illness
(13.8%). Stress (9.8%) and mononucleosis (9.2%) were also reported in a
significant percentage of cases."
Original 2001 WebSite as PDF for download