First, consider that at least some people who identify themselves as having long Covid appear never to have been infected with the SARS-CoV-2 virus. In Yong’s influential article, he cites a survey of Covid long-haulers in which some two-thirds of them had negative coronavirus antibody tests — blood tests that reveal prior SARS-CoV-2 infection. Meanwhile, a survey organized by a group of self-identified long Covid patients that recruited participants from online support groups reported in late December 2020 that around two-thirds of those surveyed who had undergone blood testing reported negative results…

Add to that the fact that the past year has produced skyrocketing levels of social anguish and mental emotional distress. Positing a potential link between psychological suffering and physical symptoms is at times derided as medical gaslighting. But there’s no question that mental suffering can produce physical suffering. A New England Journal of Medicine report showed that, across multiple continents, about half of people with depression also had unexplained physical symptoms, which often predominated over their mental ones. Sleeping problems, physical and mental slowing, persistent fatigue, and concentration problems (aka “brain fog”) are among the actual criteria for major depression in the current Diagnostic and Statistical Manual of Mental Disorders (DSM-V).