Rapid tests for Covid, RSV and the flu are available in Europe. Why not in the U.S.?

Sander Brus didn't expect a photo of his friend's grandfather's flu diagnosis to go viral. But when he shared the image on Twitter in December, he was bombarded with messages, he said. People in the U.S. wanted to know how to purchase the rapid test in the picture, which simultaneously screened people for three common respiratory viruses: Covid, respiratory syncytial virus (RSV), and two types of influenza, A and B.
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