Vaccines are set to expire in December. https://vovworld.vn/en-US/news/100-...out-being-used-former-uk-pm-warns-1028109.vov A vaccine summit being hosted by US President Joe Biden must come up with a plan this week to transfer 100 million stockpiled COVID-19 vaccines to poorer countries before they reach their expiry date, former British Prime Minister Gordon Brown said.