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A resident receives a dose of the Pfizer COVID-19 vaccine at a health center in Jakarta, Indonesia, on Jan. 13. This week, Indonesia started a program to give booster shots to the elderly and people at risk of severe disease.
Dimas Ardian/Bloomberg via Getty Images
Researchers in the U.K. have the first estimates for how long a third shot of the Pfizer vaccine will last. The findings are mixed.