The number of measles cases in the East of England in the first three months of 2013 stands at 29. The region has among the lowest occurrence of the infectious disease in England although there a fears the number of cases will rise.
It compares with a total of 49 cases in the East of England in the whole of 2012.
The government says a million children who missed out on getting the MMR vaccine in England are being targeted in a campaign to raise the level of protection against measles after an outbreak in Wales.
In the East Midlands, which includes Northamptonshire, there were 13 cases between January and March 2013 and 56 cases in the whole of 2012.