Delta COVID variant becoming globally dominant, WHO official says

posted efficacy rates topping 90%, Swaminathan said the world had been expecting more from CureVac's candidate.

"Just because it's another mRNA vaccine, we cannot presume all mRNA vaccines are the same, because each one has a slightly different technology," Swaminathan said, adding the surprise failure underscored the value of robust clinical trials to test new products. WHO officials said Africa remains an area of concern, even though it accounts for only around 5% of new global infections and 2% of deaths.New cases in Namibia, Sierra Leone, Liberia and Rwanda have doubled in the last week, WHO emergencies programme head Mike Ryan said, while vaccine access remains miniscule.

"It's a trajectory that is very, very concerning," Ryan said. "The brutal reality is that in an era of multiple variants, with increased transmissibility, we have left vast swathes of the population, the vulnerable population of Africa, unprotected by vaccines."Our Standards:Subscribe for our daily curated newsletter to receive the latest exclusive Reuters coverage delivered to your inbox.

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