As the latest measles figures reveal another increase in cases there are warnings tonight that other areas of Wales are at serious risk.
Public health officials are very concerned about Gwent but say all parts of the country could be affected, as Rob Osborne reports.
2013 is expected to be the worst year for measles in the UK for the past two decades. Read more about the illness and how it is treated.
If the Government's top adviser on immunisation thinks the risk of an emergency in England is a possibility, I believe him.