UPDATE 3-Two AstraZeneca COVID shots could be 85-90% effective, UK real-world data suggest
* Estimated 89% effectiveness against symptomatic disease* Analysis is first to study two AZ doses in real setting* Pfizer shot effectiveness drops off 10 weeks after first dose (Recasts)By Alistair SmoutLONDON, May 20 (Reuters) - Two doses of the ...
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