The death rate for coronavirus patients in English hospitals has fallen to a quarter of the level at the peak of the outbreak, which may mean that doctors are getting better at treating it.
Researchers said it was also possible that the data had a less optimistic explanation, possibly reflecting changes in those being admitted to hospital.
At the beginning of April, when there were 15,000 people in hospital with Covid-19, about 6 per cent died. Since then, the number in hospital has fallen by 2.4 per cent a day, meaning numbers have halved every 29 days.
At the same time the number of deaths has reduced by 4.3 per cent a day, meaning that it has halved every 16 days. As a consequence,
