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In this photo provided by Pfizer, a lab technician visually inspects COVID-19 Paxlovid tablet samples in Freiburg, Germany in December 2021. As more doctors prescribe Pfizer's powerful COVID-19 pill, new questions are emerging about its performance, including why a small number of patients appear to relapse after taking the drug. (Pfizer via AP, File)

In this photo provided by Pfizer, a lab technician visually inspects COVID-19 Paxlovid tablet samples in Freiburg, Germany in December 2021. As more doctors prescribe Pfizer's powerful COVID-19 pill, new questions are emerging about its performance, including why a small number of patients appear to relapse after taking the drug. (Pfizer via AP, File)

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