According to the search results, COVID rebound is a phenomenon where a person who has recovered from COVID-19 experiences a recurrence of symptoms or a new positive test result after initially testing negative. It is not a SARS-CoV-2 reinfection, but rather a brief return of symptoms that starts about two to eight days after initial recovery. COVID rebound has been reported to occur in as many as 10% of patients who have had the disease, and it may be more common in patients who were treated with Paxlovid, a therapy that is effective at keeping COVID-19 patients out of the hospital. However, there is not enough evidence to be sure about the causes of COVID rebound, and scientists are still studying the phenomenon. Most rebounds are mild and much milder than the initial peak COVID symptoms, and the CDC has reported no increased occurrence of hospitalization or death in people with COVID rebound. If a person experiences COVID rebound, they should re-isolate to protect others, and they should contact their doctor if they have any questions or concerns about their symptoms.