The HSE has issued an alert about possible measles exposure to on a flight that arrived in Dublin last week.
It relates to the passengers and crew onboard the Ryanair flight that left London Gatwick at 10 past 8 on the evening of Thursday the 16th of May.
They're advised to watch out for symptoms of measles for 21 days from exposure - or until the 7th of June.
The HSE is also reminding people, who have not already received two MMR vaccines, to do so.