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FILE – In this Sunday, July 11, 2021 file photo, a doctor fills a syringe with the Johnson & Johnson COVID-19 vaccine at a vaccination center in Kabul, Afghanistan. Top officials at the World Health Organization said Monday, July 12 there is not enough evidence to show that third doses of coronavirus vaccines are needed and appealed for the scarce shots to be shared with poor countries who have yet to immunize their populations instead of being used by rich countries as boosters. (AP Photo/Rahmat Gul, file)