The research in Israel - two months into one of the world's fastest rollouts, providing a rich source of data - showed two doses of the Pfizer shot cut symptomatic Covid-19 cases by 94% across all age groups, and severe illnesses by nearly as much .
More data from Israel's vaccination program is suggesting the Pfizer jab prevents 94% of symptomatic infections.
Participants will get one shot of the AstraZeneca vaccine followed by a dose from Pfizer, or vice versa.
Europe’s fight to secure COVID-19 vaccine supplies intensified on Thursday when the European Union warned drug companies such as AstraZeneca that it would use all legal means or even block exports unless they agreed to deliver shots as promised.
Biden thanks medical staff after taking first dose of Pfizer vaccine in front of cameras, in bid to show Americans vaccines are safe
Trump says first US citizens will receive vaccine in 'less than 24 hours'
The United States could be days away from receiving shipments of a COVID-19 vaccine as the Federal Drug Administration (FDA) will review Pfizer's candidate on Thursday.
Margaret Keenan, 90, given approved vaccine to start mass immunisation programme