Three people have died, and three are ill after a Netherlands-based cruise ship was hit by a suspected outbreak of hantavirus, authorities and media reports said on Sunday.
Here is information about the virus.
Hantavirus is primarily spread by rodents but can be transmitted between people in rare cases, according to the World Health Organisation.
People most typically become infected when the virus in rodent droppings, saliva and urine becomes airborne, such as when areas where rats and mice have nested are swept out.
According to The Lancet medical journal, the name comes from the Hantan River area of South Korea, where the virus was identified in the 1970s.
Hantavirus is a family of viruses that cause two illnesses, one that primarily affects the lungs and the other that attacks the kidneys. The first gets the most attention because it has a high fatality rate of about 40%.

