 "AstraZeneca, pharma, coronavirus, vaccine")
The relatively short shelf life of AstraZeneca Plc's COVID-19 vaccine is complicating the rollout to the world's poorest nations, according to officials and internal World Health Organization documents reviewed by Reuters.
It is the latest headache to plague the COVAX vaccine-sharing project, co-led by the WHO and aimed at getting shots to the world's neediest people.
Initially, poorer countries and COVAX lagged richer countries in securing vaccine supplies, as wealthier nations used their financial might to acquire the first available doses.
As vaccine production ramped up and richer states began donating excess doses, some countries - particularly in Africa -
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