The ship is currently in Cape Verde - three patients, including the 56-year-old from Britain, were evacuated to the Netherlands on Wednesday.
Passengers on the ship showing no symptoms are allowed to leave, authorities say, after 49 people fell ill from gastrointestinal sickness.
The World Health Organization said one case of hantavirus infection has been confirmed, with five more suspected cases under investigation.
Almost 200 so-called Russian "shadow fleet" vessels have entered UK waters since the prime minister threatened to intercept them nearly seven weeks ago, BBC Verify analysis suggests. In March, Sir ...
Ukrainian specialists are preparing to protect merchant ships in the Strait of Hormuz from Iranian attacks. TAF Industries will use Kolibri and Octopus interceptor drones to neutralize threats.