Almost 200 cases of measles have been diagnosed in the Swansea and Neath Port Talbot areas since November, with 20 cases identified in the last week alone.
Symptoms can include:
- Red eyes
- Blocked nose
- Blotchy rash beginning on the face and spreading downwards to the rest of the body over several days
Typically people will be infectious from the day before their first symptoms until four to five days after the appearance of the rash.
Source: Public Health Wales
More top news
Welsh stars of the stage and screen will meet Prince Charles when he hosts a gala concert for the Royal Welsh College of Music and Drama.
The Children's Commissioner has released some of her top priorities for children and young people living in Wales for the next few years.
Welsh Government has put forward proposals for students at special schools to have regular sight tests in the classroom.