A dose of a Moderna covid-19 vaccine being prepared.

A dose of a Moderna covid-19 vaccine being prepared.
Photo: Sholten Singer (AP)

Here’s one weird trick for making the most out of your next two-dose vaccine: get a shot in both arms. A recent study found evidence that a two-arm approach can noticeably, if modestly, improve the body’s immune response to covid-19 compared to two shots in the same arm. More research will be needed to confirm whether this method should become widely recommended for future vaccines, however. – Ed Cara Read More

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