Fifteen cases of measles have been confirmed in county Kerry.
It is understood that a person infected with the highly contagious illness traveled from Dublin to the county in May by plane and others became infected as a result.
In the past number of weeks several cases of measles have been confirmed in Dublin, Sligo, Mayo, Louth and Limerick.
Anyone who may have symptoms is being asked to contact their GP to arrange a home visit and is being urged not to travel to any clinics or hospitals due to the contagious nature of measles.
University Hospital Kerry is also asking visitors not to bring children to the hospital at this time.