A measles outbreak in Cheshire has led health officials to remind parents their children must receive both doses of the vaccine to be fully protected against the disease.
The Health Protection Agency's Cheshire and Merseyside Health Protection Unit said three confirmed cases and a further 11 probable or possible cases have been reported in the Sandbach and Middlewich areas.
Dr Sam Ghebrehewet, from the unit, said: "It's worrying that we potentially have 14 cases of measles in Cheshire and my fear is that we will see further outbreaks, here and elsewhere in the region."
He added: "It is so important for all children and young people up to the age of 18 to be protected by two doses of MMR vaccine and our Primary Care Trust partners are working with schools and GP practices to get that message across to parents, guardians and young people themselves."
Anyone with concerns or seeking information about the MMR campaign is advised to consult their family doctor.