UK Prime Minister Boris Johnson has pledged to donate most of the UK’s surplus vaccine supply to poorer countries.
He will urge rich countries to back a 100-day target for developing new vaccines for future emerging diseases.
The UK has ordered more than 400 million doses of various vaccines, so many will be left over once all adults are vaccinated.
But anti-poverty campaigners say the UK is not doing enough.
Decisions on when and how much of the surplus will be distributed will be made later this year, with ministers taking into account the supply chain and whether booster shots are needed in the autumn.