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The flu shot finally gets an upgrade

A scientist works in the lab at the Moderna Inc. headquarters in Cambridge, Massachusetts. | Adam Glanzman/Bloomberg via Getty Images This story appeared in Today, Explained, a daily newsletter that helps you understand the most compelling news and stories of the day. Subscribe here. The Food and Drug Administration approved Moderna’s mRNA flu vaccine this week — a major public health breakthrough for an administration that’s been troublingly down on vaccines. The flu is a gigantic and costly illness, causing 1 billion infections and 300,000 deaths each year. But this new shot, buil...