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
The winds have eased already, but we'll see wintry flurries over the mountains and icy patches on the roads!
The Valleys is home to some of Wales' most successful entertainers and personalities.
The South Wales Valleys once produced coal, but now they're producing wind energy - with the biggest onshore windfarm in England and Wales.