A potential vaccine has made so much progress that US officials have declared hopes the coronavirus fight could be won within a year.
Researchers developing the vaccine candidate say they could potentially produce as many as a billion doses a year by early 2021.
The US' top infectious diseases expert has described the vaccine as a "winner" as Moderna Inc's trials show early signs of success in the global race to end virus misery.
Its jab provoked immune responses in all 45 healthy volunteers in an early-stage study, US researchers have revealed - but more work is required before it could be ready.
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