As we all toddle into the New Year with whatever mix of hope and/or trepidation we drag along, some of us are also dragging some cryptic phenomena — physical, emotional, cognitive, attentional — that defy our usual experience of viral illness. "Post-acute sequelae of SARS-CoV-2 infection" (PASC) is the tedious academese acronym for the variety of symptoms that can hang on and even cycle in and out of our experience after having had a COVID (also an acronym — "COrona VIrus Disease") infection. Fatigue, phantom aches and pains, what feels like a sudden cognitive "brownout" with a loss of IQ points, and quick-trigger emotional reactivity, all may weave in and out of the........

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