For me, long COVID is best described as unsettling. Unsettled, physically, when dizziness sets in. Unsettling in the capriciousness of the illness, repeatedly returning, changed. Unsettling, worst, in the loss of trust in your mind, brain fog occluding central parts of your self.
There’s a lot of evidences to show people develop post-viral fatigue like symptoms after suffering either viral or bacterial infection. “A recent review found Epstein-Barr Virus (EBV) antibody activity to be higher in patients with CFS” https://en.m.wikipedia.org/wiki/Chronic_fatigue_syndrome …
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