Authorities around the world are racing to trace dozens of passengers who disembarked from the cruise ship at the centre of a deadly hantavirus outbreak before isolation measures were implemented.

It emerged for the first time on Thursday that at least 29 passengers of 12 nationalities left the MV Hondius on 24 April after the first fatality, prompting a scramble to identify and track their movements since then.

However, the World Health Organization ruled out any Covid-scale crisis. “This is not the start of an epidemic. This is not the start of a pandemic. This is not Covid,” Dr Maria Van Kerkhove, the agency’s director for epidemic and pandemic preparedness and prevention, told reporters.