Passengers on board a bus travelling from Dublin Airport to Co Tipperary may have been exposed to measles.
An alert has been issued following a confirmed case in a passenger who flew into Dublin from Naples on Saturday morning.
The HSE is advising all passengers on the bus or plane to be aware of any symptoms for the next two to three weeks.
The alert affects a JJ Kavanagh bus - number 717 - which departed Dublin Airport for Clonmel at 4pm on Saturday afternoon.
It also affects Aer Lingus flight EI-451, which left Naples for Dublin at 11.40am on Saturday morning.
The HSE says any passenger who is pregnant, immuno-compromised, or under 12-months-old, should be brought to the attention of a GP or hospital for immediate advice, and other passengers should be alert for symptoms like a cough, sore eyes, high temperature or a rash.
Ring ahead before attending any healthcare setting to let them know you were exposed - and don't make any further travel arrangements.
