An adult passenger suffering from measles who travelled on a Tallink ro-pax from Finland has sparked a health warning.
Passengers on the 58,000-gt Silja Serenade (built 1990) between 1 and 3 February have been advised to check they have been vaccinated, YLE reported.
The ferry serves the Helsinki to Stockholm route.
A passenger was diagnosed with measles on Monday and is believed to have been infected in southern Finland, according to the National Institute for Health and Welfare (THL).
Reports of measles cases in Finland started appearing towards the end of last year.
THL has warned that people born there in the 1970s in Finland may not have been vaccinated.
Tallink unit Silja said it is attempting to reach passengers who were on the weekend trip.
