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A medical worker wears plastic gloves at a temporary screening clinic for the coronavirus in Seoul, South Korea, Monday, Nov. 29, 2021. The emergence of the new omicron variant and the worldâÄ™s desperate and likely futile attempts to keep it at bay are reminders of what scientists have warned for months: The coronavirus will thrive as long as vast parts of the world lack vaccines. (AP Photo/Lee Jin-man)