An ambitious global effort to procure COVID-19 vaccines and ensure fair and equitable distribution between rich and poor countries faces a huge uphill battle. The United Nations-backed Covax initiative now has more than 185 countries on board, but it remains deeply underfunded and faces countries that are supposed to accumulate the most promising vaccines. At the G20 summit this weekend, United Nations Secretary-General Antonio Guterres hopes to change that. UN correspondent Liling Tan has the story. .
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