<p>An observational study of patients being treated for acute COVID-19 in a multicenter health care system observed virologic rebound in about 20 percent of patients treated with nirmatrelvir-ritonavir (N-R) versus about 2 percent of those who did not receive treatment. The findings are published in Annals of Internal Medicine.</p>
<p>A new study by investigators from <a href="https://www.massgeneralbrigham.org/">Mass General Brigham</a> found that one in five individuals taking Nirmatrelvir-ritonavir therapy, commonly known as Paxlovid, to treat severe symptoms of COVID-19, experienced a positive test result and shedding of live and potentially contagious virus following an initial recovery and negative test—a phenomenon known as virologic rebound. By contrast, people not taking Paxlovid only experienced rebound about 2 percent of the time. Results are published in <a href="https://www.acpjournals.org/journal/aim/authors1"><em>Annals of Internal Medicine</em></a>.</p>