Health officials are urging the public to check they are vaccinated against measles after a steep rise in cases.
Public Health England (PHE) said there have been 913 laboratory-confirmed measles cases in England so far this year.
This is an increase compared to the 259 cases during the same period last year.
Among the recent surge this year 34 cases have been confirmed in the North West, including three in Greater Manchester, 25 in Cheshire and Merseyside, and six in Cumbria and Lancashire.
Measles is a highly infectious viral illness that can sometimes lead to serious complications and can be fatal in very rare cases.
Outbreaks across England began emerging in the Spring and were linked with travel to and from Europe where there have been ongoing problems.