It's possible for long covid to be real and not have a definitive biomarker as evidence. For instance, it would have been obvious that someone with Alzheimers o

It's possible for long covid to be real and not have a definitive biomarker as evidence. For instance, it would have been obvious that someone with Alzheimers or dementia was ill even before the invention of the microscope. Likewise with long covid, it is extremely frustrating and dehumanizing when aloof skeptics question its very existence when you can simply talk to the sufferers and see the proof for yourself. Why would a marathoner suddenly be unable to walk up the stairs without their heart rate rising to over 150bpm? Our lack of understanding of the illness is not good reason to dismiss the existence of the illness; or else if it were, then the field of medicine should have never began at all!