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by Geimfari 2595 days ago
Yes, CFS does often comes as a result of a mononucleosis, about 22% of adult mono cases have CFS after 6 months, and <5% have CFS after 2 years. It's much better to contract mono as a child.

You don't get "tested" for CFS yet, it's currently a diagnosis given when all other explanations have been tried.