Covid-19 and the Flu

Long before the coronavirus that causes Covid-19 emerged, annual outbreaks of influenza posed a serious threat. During the pre-pandemic 2018–19 flu season—considered to have had a peak activity of moderate severity for the flu—the United States recorded 35.5 million cases of influenza and more than 34,000 flu-associated deaths. In contrast, the 2020-21 flu season saw […]