RIO DE JANEIRO, BRAZIL - The World Health Organization (W.H.O.) said on Friday that the ChAdOx1 nCoV-19 vaccine, produced by Oxford University in partnership with the AstraZeneca laboratory, is the "most advanced" in the world "in terms of development" and leads the race for an immunizer against Covid-19. The formula is being tested in Brazil and South Africa following successful trials in the UK.
Soumya Swaminathan, the organization's . . .