With more than 750,000 cases of coronavirus worldwide and more than 35,000 deaths, a global medical race is underway to develop a vaccine for the virus, but it can't be done overnight, say health experts.
The World Health Organisation says there are currently 20 coronavirus vaccines being developed, but Australian researchers are citing reports of up to 60 candidate vaccines in the works.
None of them are ready yet to be used on a human being.
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