Public Health Wales says the 808 measles cases reported include 70 in the Powys Health Board area, with the majority in the north of the county.
Parents are reminded that measles is circulating and vaccination for unvaccinated children is now urgently needed.
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.