Sure Signs You've Already Had COVID, According to Specialists By Leah Groth of ETNT Health | Sure Signs You've Already Had COVID, According to Specialists In the early days of the pandemic, we believed that once an individual initially recovered from a COVID-19 infection, the worst was over. However, over the last many months, researchers, doctors, and health experts realized that for some people, the most crippling manifestations of the coronavirus occur after the initial infection has passed. Post-COVID Syndrome, "Long Hauler's Syndrome, or long-term COVID are the names given to a mysterious condition that can occur many months after 'recovering' from COVID-19," William Li, MD, physician, scientist and author of the