It is probably about or a bit less than 1%. Much higher figures have been flying about, but the UK’s chief medical officer, Chris Whitty, is one of those who believes it will prove to be 1% or lower. The World Health Organization’s director general, Dr Tedros Adhanom Ghebreyesus, talked of 3.4%, but his figure was calculated by dividing the number of deaths by the number of officially confirmed cases. We know there are many more mild cases that do not get to hospital and are not being counted, which would bring the mortality rate significantly down.
Deaths are highest in the elderly, with very low rates among younger people, although medical staff who treat patients and get exposed to a lot of virus are thought to be more at risk. But even among the over-80s, 90% will recover.
"There's another whole cohort that is either asymptomatic or minimally symptomatic," Anthony Fauci, the director of the US National Institute of Allergy and Infectious Diseases, said at a briefing last month.
"We're going to see a diminution in the overall death rate."