COVID, RSV and the flu: A case of viral interference?

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Three years into the pandemic, COVID-19 is still going strong, causing wave after wave as case numbers soar, subside, then ascend again. But this past autumn saw something new—or rather, something old: the return of the flu. Plus, respiratory syncytial virus (RSV)—a virus that makes few headlines in normal years—ignited in its own surge, creating a “tripledemic.”

The surges in these old foes were particularly striking because flu and RSV all but disappeared during the first two winters of the pandemic. Even more surprising, one particular version of the flu may have gone extinct during the

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