Countries around the world raced Thursday to track down passengers who disembarked from a cruise ship struck by a Hantavirus outbreak before it was stranded off the coast of Cape Verde, in an effort to contain the spread of the disease.

Three people – a Dutch couple and a German national – died in the outbreak on the MV Hondius. Eight people, ​including a Swiss citizen, are suspected of having contracted the virus, according to the ​World ⁠Health Organization.

The Dutch government has said around 40 passengers had disembarked the ship in Santa Helena, where the ship made a stop on its way to Cape Verde – before the outbreak was reported.

Contact tracing

The whereabouts of many of these passengers is as yet unknown.