Your questions, answered I tested positive for coronavirus eight days ago. I tested negative yesterday. Today I was shocked to see that I tested positive. On top of that, I have the typical headache – which has started again. Sounds like you're experiencing what's commonly being called covid rebound, which is exactly what it sounds like. After feeling sick and testing positive for the coronavirus, symptoms subside and you test negative. Then, the virus rebounds. And you test positive – again. It is a rare but real phenomenon that researchers are still trying to understand. "It probably has to do with fluctuating amounts of virus and your viral load," which Robert Wachter, chair of the University of California, San Francisco, Department of Medicine, said "can go up and down a little bit day to day depending on your immune system. You may be just below the threshold on a certain day and just above the threshold the next day." Exactly how often it occurs, why it happens and what — if anything — to do about it remain matters of debate. According to an advisory issued by the Centers for Disease Control and Prevention on May 24, covid-19 rebound has been reported to occur between two and eight days after initial recovery and "may be part of the natural history" of the coronavirus, "independent of treatment with Paxlovid and regardless of vaccination status." It has been known to occur after people take the antiviral pill Paxlovid, a five-day pill regimen that should be started within five days of symptom onset. But it can also occur in people who have not taken the drug. Current research shows most rebound cases are mild. But Wachter says the big thing to remember is, "If you start testing positive again, you definitely are infectious again." | 
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