More than 1,000 healthcare workers and 14,400 others linked to a Covid-19 outbreak at a hospital in Hanoi have tested negative for the coronavirus, the Vietnamese capital’s ruling body has confirmed.

Bach Mai hospital, one of the country’s biggest medical centres, has been under lockdown since March 28 after authorities became concerned that cases there would spiral out of control.

Reuters quoted Hanoi People’s Committee chairman Nguyen Duc Chung as saying that “another 9,000 people who visited or looked after patients at Bach Mai must be tested by April 12.”