The NCL ICB is responsible for co-ordinating NHS services across Barnet, Enfield, Haringey, Camden and Islington.
Its chief medical officer Dr Jo Sauvage said: “Measles resurges when vaccination rates fall, but this is something we can turn around.
“The vaccine is safe and effective, and by boosting uptake quickly we can prevent further outbreaks.”
The outbreak continues to hit London the hardest, with 65% of the 195 total number of cases in England this year occurring in the capital.
The vast majority of infections are affecting children aged 10 or younger.
It is not clear where the other 43 cases in London have been identified, as the UKHSA only publishes specific information on boroughs with ten or more reported cases.
Outside the capital, Birmingham has had the highest recorded outbreak, now reaching 32 cases.
The UKHSA said reported figures were “likely to underestimate” the actual number of infections, especially over the past month – due to lags in cases being reported.