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COVID vaccines

Sinovac's COVID-19 shot is 83% effective, not 91%, Turkey says

Result differs widely from Brazil test, prompting criticism over varied methods

Clinical trials for Sinovac's COVID-19 vaccines are being conducted in Turkey.   © Reuters

ISTANBUL -- Researchers in Turkey on Wednesday reported an efficacy rate of 83.5% for the coronavirus vaccine developed by Chinese company Sinovac Biotech based on final Phase 3 clinical trial results there, down from 91.25% announced in late December from interim results.

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