AstraZeneca said on Monday its vaccine for the novel coronavirus, developed along with the University of Oxford, could be around 90 per cent effective under one dosing regimen.
"This vaccine's efficacy and safety confirm that it will be highly effective against COVID-19 and will have an immediate impact on this public health emergency," Pascal Soriot, Astra's chief executive, said in a statement.
British Health Secretary Matt Hancock described as "fantastic news".
"These figures... show that the vaccine in the right dosage can be up to 90 per cent effective," he told Sky News, after an announcement from AstraZeneca.
"We've got 100 million doses on order and should all that go well, the bulk of the rollout will be in the new year."
The British drugmaker's preliminary trial results mark a fresh breakthrough in the fight against a pandemic that has killed nearly 1.4 million people and roiled the global economy.
Hamas handed over three Israeli hostages on Saturday, whose emaciated appearance shocked Israelis following their release on live TV, in the latest stage of a ceasefire deal aimed at ending the 15-month war in Gaza.
The US Coast Guard in Alaska found the wreckage of a small plane atop frozen sea ice on Friday, after the aircraft suddenly lost altitude on Thursday and the crash killed all 10 people on board, officials said.
A US judge has temporarily allowed roughly 2,700 US Agency for International Development employees put on leave by President Donald Trump's administration to go back to work, pausing aspects of a plan to dismantle the agency.
Hamas accused Israel of multiple breaches of their ceasefire agreement on Friday, a day before the scheduled exchange of three more Israeli hostages for Palestinian prisoners in the latest stage in a fragile deal aimed at ending the war in Gaza.