One morning a few weeks ago I was chatting with my friend Horacio, a mathematician in the New York City area. He told me he’d lost his sense of smell for a couple of weeks in April. He was cooking for Passover and couldn’t even smell the gefilte fish. He didn’t think much of it and didn’t connect it to the fact that he had been slightly ill for a few days. I suggested that he get tested for antibodies of SARS-CoV-2, the virus that causes COVID-19; and that he take an online survey for smell and taste symptoms associated with recent respiratory illness (more on that shortly). It turned out Horacio had antibodies, so he signed up to donate plasma. This was a

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