Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and President Biden's chief medical adviser, recently revealed he is experiencing a rebound of his Covid-19 infection after taking the antiviral medication Paxlovid. Fauci described the interesting course" his own infection had taken on Tuesday during an appearance at Foreign Policy's Global Health Forum. "I turned positive about two weeks ago, with very minimal symptoms. When they increased, given my age, I went on Paxlovid for five days," Fauci said. Fauci, 81, credited the drug with keeping him out of the hospital. After five days on the drug, he tested negative. He had three consecutive days of negative tests. On the fourth day he tested positive again. "It was sort of what people are referring to as a Paxlovid rebound," he said. The CDC issued a health alert to doctors on May 24, advising that Covid-19 symptoms sometimes come back, and that may just be how the infection plays out in some people, regardless of whether they're vaccinated or treated with medications like Paxlovid. In Fauci's case, he said his symptoms got worse when they returned after treatment. "Over the next day or so I started to feel really poorly, much worse than in the first go around," he said. His doctors prescribed another course of Paxlovid. "I went back on Paxlovid, and right now I am on my fourth day of a five-day course of my second course of Paxlovid. Fortunately, I feel reasonably good. I mean, I'm not completely without symptoms, but I certainly don't feel acutely ill."