The experimental drug, developed by the US National Institutes of Health and Moderna, will be tried on 30,000 volunteers in the US who won't know if they're getting the real shot or a placebo in order to see which group experiences more infections.
Britain has said it was the first such deal which Pfizer and BioNTech had agreed for the supply of their vaccine, which is being tested in early to mid-stage trials.
The large-scale trial of the vaccine developed at the University of Oxford in Britain is being conducted in South Africa, Britain and Brazil.
Researchers led by a team from the University of Oxford said daily doses of the steroid could prevent one-in-eight ventilated patient deaths and save one out of every 25 patients requiring oxygen alone.
Dramatic images on Sunday of protesters in the port city of Bristol tearing down a statue of 17th century slave trader Edward Colston and throwing it into the harbour inspired campaigners in Oxford to seize the moment.
A statue of Edward Colston was toppled and dumped into a river at a rally in memory of an American man killed by a US police officer.
Sometimes called a "tropical Trump", Brazil's President Jair Bolsonaro has followed a similar script to his US counterpart in his handling of Covid-19. Meanwhile in Europe, badly-hit countries slowly continue on a path toward a post-pandemic normal.
Novel coronavirus has infected more than 6.4 million people around the world. Here are pandemic-related updates for June 2:
The global coronavirus pandemic has affected more than five million people, with over 334,000 deaths. Here are coronavirus-related updates for May 22:
From the US to China, scientists are racing to develop a drug that can fight the deadly pandemic.
Between 2015 and 2017, one in three Oxford colleges failed to offer any black students a place. Last year, only 48 black students took up a place out of 12,000 undergraduates.
To many outsiders the dispute between Greece and Macedonia may seem petty, yet the outcome of this referendum will have a significant impact on Balkan stability.
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