The US in recent weeks has made deals to acquire hundreds of millions of doses of potential Covid-19 vaccines from several companies as part of its Operation Warp Speed programme.
With over 737,000 deaths and more than 2,100,000 Covid-19 infections worldwide, a vaccine for the virus is widely anticipated.
As wealthy nations ensure themselves a sufficient supply of vaccines, there are concerns the hoarding could lead to vaccine nationalism and a shortage for others.
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.
Coronavirus has infected more than 13.6 million people, of whom over 7.8 million have recovered and some 584,000 have died. Here are the updates for July 15:
The data is from eight people who took part in a safety trial that kicked off in March as the global pandemic caused by the novel coronavirus was spreading.
From the US to China, scientists are racing to develop a drug that can fight the deadly pandemic.
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