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This could be Paxlovid rebound but what is more important is that everytime a person has a Covid rapid antigen test that is positive then you must assume that you are still shedding virus and could be infectious to the people around you. You should therefore limit you time outside of the home, practicing a self-quarantine, and when you do leave the home then you should wear a well-fitting mask (such as a KN95 mask) to reduce the risk that your exhaled breath with infect others.