Covid-19 vaccines will be wasted in their millions if donated to poorer countries in one go.
That's the warning from children's charity UNICEF which says rich nations should donate 20% of their vaccine supplies by August.
But UNICEF says doses need to be provided with a steady supply because developing economies don't have the resources to use large numbers rapidly.
UNICEF's Liam Sollis says wealthy countries need to act quickly.
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