U.S. flu vaccines were redesigned after an influenza strain disappeared globally. Physical distancing and masking during the early days of COVID likely pushed the strain into oblivion.
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Sarah Boden
Sarah Boden covers health, science and technology for 90.5 WESA. Before coming to Pittsburgh in November 2017, she was a reporter for Iowa Public Radio where she covered a range of issues, including the 2016 Iowa Caucuses.