Why is Africa struggling to get COVID-19 vaccines?

Africa is supposed to receive 90 million doses of COVID-19 vaccines from the joint UN-led COVAX initiative this month, but how much more needs to be done as higher-income countries snap up most of the supplies? 

Linda Bauld, Professor of Public Health at the University of Edinburgh;  
Hannah Ryder, CEO of Development Reimagined, a consulting firm. 

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