Pfizer and AstraZeneca have released additional data from their trials on the efficacy of the vaccines.
The US drug regulator has released its positive initial analysis on the Pfizer-BioNTech vaccine saying the two-dose vaccine is "highly effective" in preventing symptomatic COVID-19.
Key analysis was that the vaccine starts providing protection 10 days after the first dose itself. It is at least 52 percent effective before the second dose, meaning even if people miss their second dose they may get some protection from transmission although how long this immunity will last is still unclear.
CNBC-TV18’s Archana Shukla brings more details.
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