The race is on to develop a vaccine against COVID-19.
At least 70 potential treatments are in development, with three at the clinical stage when human trials begin.
Outside China, the US is the only other country undertaking human testing.
America’s top medical expert Anthony Fauci has said a vaccine could be ready within 12 to 18 months.
But health officials elsewhere say it could take even longer, as others warn against rushing the process.
John Nicholls is the clinical professor of pathology at the University of Hong Kong.
His team was one of the first outside mainland China to reproduce COVID-19 in a laboratory for research.
He joins us on Skype from Hong Kong.
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