Covid Lockdowns Prevented Other Infections. Is That Good?

The key finding in the study, though, wasn’t that more people had allergies; that was an accepted observation already. It was who had them and who didn’t. The author, immunologist David Strachan, reported that people then in their twenties, who had been part of a huge, lifelong study of British children born in 1958, seemed less likely to have hay fever if they had grown up with older siblings. The implication was that the older sibs—who would have been leaving the house, going to school, and running around outdoors with friends when the toddlers stayed home—were exposing younger kids to something they brought home. It was a phenomenon that wouldn’t be available to an eldest or only child—people who, in this original…

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