Pfizer COVID-19 vaccine: What does '90% effective' mean?
Edited By WION Video Desk
Published: Nov 11, 2020, 05:00 IST | Updated: Nov 11, 2020, 05:00 IST
Scientists on Monday said initial trial results for Pfizer Inc and BioNTech's coronavirus vaccine far outpaced their expectations for protection against a completely new disease, but that many questions remain unanswered.
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