United Nations said Monday it would stockpile one billion syringes around the world by the end of 2021, to be used for the delivery of any future coronavirus vaccine.UNICEF, the UN Children's Fund, said it aims to get 520 million syringes in its warehouses by the end of this year, to guarantee an initial supply in countries ahead of the vaccine."The world will need as many syringes as doses of vaccine," UNICEF said in a statement.UNICEF said it was also buying five million safety boxes for used syringes.The number of confirmed coronavirus cases worldwide passed 40 million on Monday, according to an AFP tally based on official sources.