Some celebrity vaccine endorsements have delighted social media users. But epidemiologists say there isn’t much evidence proving that they boost vaccine uptake.

Pelé, Dolly Parton and the Dalai Lama have little in common apart from this: Over a few days in March, they became the latest celebrity case studies for the health benefits of Covid-19 vaccines.

“I just want to say to all of you cowards out there: Don’t be such a chicken squat,” Ms. Parton, 75, said in a video that she posted on Twitter after receiving her vaccine in Tennessee. “Get out there and get your shot.”

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