Hip
Senior Member
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Ok, let's research it here and see what the data says.
My survey of ME/CFS patients who got tested for craniocervical instability has a question on ME/CFS onset, and you can see from the pie chart survey results below, only around 15% reported their ME/CFS started after mononucleosis:
Now it's possible that some people with mononucleosis might have just assumed they had the flu rather than mono (since symptoms are similar), and so answered the survey question stating they had a "flu-like illness, gastrointestinal or upper respiratory infection".
Typically it is enterovirus which causes a flu-like illness, gastrointestinal upset or upper respiratory infection, but some mono cases might be mistakenly included in that category.