There have now been 103 confirmed cases of measles in London so far this year.
That's almost double to 52 cases of the disease which had been recorded by this point last year.
Experts now expect that the number of cases this year will exceed the total of 139 recorded last year.
The rise in case is being blamed on a fall in take up of the MMR vaccine, following a scare.
Health officials are urging parents to get their children vaccinated if they missed out on the MMR.
Public Health England is running a catch up program offering the jabs.
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