FILE - In this Oct. 11, 2020, file photo, people wear protective face masks to help prevent the spread of the coronavirus in downtown Tehran, Iran. Iran's campaign to inoculate its population against the coronavirus and promote itself as an emerging vaccine manufacturer inched on as health authorities announced Tuesday, March 16, 2021, that the country's third homegrown vaccine has reached the phase of clinical trials. (AP Photo/Ebrahim Noroozi, File)
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