FILE - Used syringes in a bin at Swaminarayan School vaccination centre, in London, Saturday, Dec. 4, 2021. The World Health Organization expressed concerns that rich countries spooked by the emergence of the omicron variant could step up hoarding of COVID-19 vaccines and strain global supplies again. It said that could complicate efforts to stamp out the pandemic. The U.N. health agency reiterated its advice to governments against wide-scale use of boosters in their populations so that well-stocked countries instead can send doses to vulnerable people in poorer countries that have largely lacked access to them. (AP Photo/Alberto Pezzali, File)
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