“I wouldn’t like to make any specific comment on that, because I haven’t read those publications in detail,” Dr Mike Ryan, head of the WHO’s emergencies programme, told an online briefing in response to a question, adding it can sometimes take a number of publications to determine a drug’s efficacy.

“Clearly we have the randomised control trials that are underway both in the UK and US, the ‘Solidarity trials’ with WHO. Remdesivir is one of the drugs under observation in many of those trials. So I think a lot more data will come out,” he said.

Ryan added: “But we are hopeful this drug and others may prove to be helpful in treating COVID-19.”