Around 3,400 people turned out to receive the MMR vaccination in the latest round of clinics in South Wales.
Abertawe Bro Morgannwg University Health Board says 1,800 people were vaccinated at the area's four drop-in clinics yesterday - the highest turnout so far.
Meanwhile Aneurin Bevan Health Board have confirmed 1,600 turned up to receive the jab yesterday.
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.