The number of measles cases across Wales is expected to rise. The latest figures are due to be released today. It's not known whether the outbreak, which currently stands at over 600 cases, has reached its peak.
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.