On Friday the central Chinese city of Wuhan, where the novel coronavirus first emerged last year, revised upwards its death toll by 1,290 to 3,869 – an increase of 45%.

It also revised up its number of confirmed cases by 325 to 50,333, according to a statement from the Wuhan Municipality.

The authorities gave four reasons for the revision in official figures.

Some patients died at home without seeing a doctor or being tested for the virus as hospitals were overwhelmed during the epidemic’s peak, said the statement.

Late and incomplete reporting due to medical workers and institutions overwhelmed

Read more: China: Wuhan revises up 45% coronavirus fatalities