The research found that four weeks after the first dose, hospital admissions were reduced by 85% and 94% for the Pfizer and AstraZeneca vaccines respectively.
Dangosodd ymchwil fod derbyniadau i’r ysbyty wedi lleihau 85% a 94% bedair wythnos ar ôl dos cyntaf y brechlynnau Pfizer ac AstraZeneca yn y drefn honno.