npub1swyxvkhew2qcjpgmsf7c4salsxsedx4veavatjd5yzhxhmtk58aq54snpj (npub1swy…snpj) Post viral illness after flu ("long flu") would definitely include ME/CFS (and also maybe POTS, Fibro, and other illnesses).
Research has been done on ME/CFS triggered by flu virus, as well as other viruses like SARS or EBV.
Here's a 2015 study about H1N1 and "CFS/ME" (sic)
"Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is associated with pandemic influenza infection, but not with an adjuvanted pandemic influenza vaccine"
https://pubmed.ncbi.nlm.nih.gov/26475444/