Very interesting article. I got covid in March followed by long covid (LC). The LC slowly declined and disappeared completely 3 months ago after catching a cold. The cold wasn't bad, but I've noticed with my various autoimmune diseases that they are better after being sick with other things. When folk have bad Reactive Arthritis or RA doctors sometimes give methotrexate, which decreases WBC and suppresses the immune system. I think the purpose is to distract the immune system so it goes back to looking out for invaders, instead of attacking us.