In this file photo, Tedros Adhanom Ghebreyesus, Director General of the World Health Organization, WHO, speaks at the WHO headquarters, in Geneva, Switzerland, May 24, 2021. A group of four Republican senators sent Mr. Tedros a letter on Dec. 10, 2021, in which they took issue with the WHO's official explanation for why it didn't name the omicron variant the "xi" variant. (Laurent Gillieron/Keystone via AP, File)
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