GENEVA, Nov 9 (Reuters) - A COVID-19 vaccine may be rolled out by March 2021 to the most vulnerable, which could fundamentally change the course of the pandemic, a senior World Health Organization (WHO) official said on Monday. Bruce Aylward also told the WHO’s annual ministerial assembly that interim results announced earlier in the day from Pfizer Inc’s phase-three vaccine trials were “very positive”. Pfizer Inc PFE.N said on Monday its experimental COVID-19 vaccine was more than 90% effective.
Reporting by Emma Farge, Stephanie Nebehay and Michael Shields;
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