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A medical worker administers a shot of Pfizer COVID-19 vaccine to a man at Belgrade Fair makeshift vaccination center in Belgrade, Serbia, Tuesday, Aug. 17, 2021.  Serbia has started administering a third, or booster, dose of four different vaccines, including Sinopharm, Pfizer, Sputnik and AstraZeneca, to people who previously were vaccinated at least 6 months ago.  (AP Photo/Darko Vojinovic)

A medical worker administers a shot of Pfizer COVID-19 vaccine to a man at Belgrade Fair makeshift vaccination center in Belgrade, Serbia, Tuesday, Aug. 17, 2021. Serbia has started administering a third, or booster, dose of four different vaccines, including Sinopharm, Pfizer, Sputnik and AstraZeneca, to people who previously were vaccinated at least 6 months ago. (AP Photo/Darko Vojinovic)

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