The NHS has contacted passengers on the NorthLink ferry sailing from Aberdeen to Lerwick earlier this month among the concerns they may have to contact someone who has been diagnosed with measles later.
Grampian NHS issued the public health alert after the boat trips left Aberdeen in the evening of 7 October.
The NHS Grampian and NHS Shetland confirmed in a joint statement that the two health boards were working with partners to investigate one case of measles in adulthood from Perth and Kinross, with links to Aberdeen and Shetland.
The health board has advised passengers on the boat to be “aware of the symptoms and symptoms of measles and the action you will take if you become ill”.
The NHS says measles is a highly infectious viral illness that can be very unpleasant and sometimes severe, although the effectiveness of vaccination has greatly reduced its prevalence in the UK.
Symptoms include fever, inertia, runnyctivitis nose, cough and red rash, blotchy which starts at the head and spreads over the chest and limbs.
People with measles are infectious for about five days before the rash and about four days after it appears.
Passengers are advised that if they develop symptoms, they should call their GP to avoid sitting in a waiting room.
Those on the boat deemed to be more at risk of measles were asked to contact health services as soon as possible as they may require immediate treatment.
Vulnerable groups include pregnant women, children under 12 months and people with weakened immune systems, due to illness or treatment such as chemotherapy or steroids.
Measles, mumps and rubella (MMR) doses are usually issued after the baby's first birthday and before school age.
NHS Grampian said that people who are already vaccinated with two doses are unlikely to require further action, unless they develop symptoms.
Passengers were also informed if they are unsure whether they have completed two doses of the MMR vaccine they should contact their GP practice to ascertain.
In 2016, the World Health Organization confirmed that the UK was free of measles, but the country lost this status earlier this year after an increase in cases.
In a joint statement, NHS Grampian and NHS Shetland said: “Measles is a highly infectious viral illness that causes fever, cough, and red brown spots.
“The infection is easily spread and you can catch measles by direct contact with an infected person, or through the air when coughing or sneezing.
“Measles is most common in young children, but can be caught by anyone who is not fully immunized.
“The safest and most effective way to prevent measles is the measles-mumps-rubella vaccine (MMR). Two doses of MMR vaccine are needed to ensure full protection.
“We will encourage everyone to make sure their vaccines are up to date. It is not too late to get a vaccine. You can check with your GP practice to find out what vaccines you may be eligible for. ”
Further information on measles is available on the Inform NHS website.
. (tagsToTranslate) Grampian (t) Health (t) Measles (t) NHS (t) NHS (t) Shetland (t) NorthLink