In the year following, a larger outbreak occurred in Manchester, England. It took nearly a year to be controlled. In this event, 1,073 cases were identified. While representing one of the largest outbreaks since the vaccine was introduced, in retrospect, the outbreak could have been much worse. Upon examination of the city, some 31,600 children were under vaccinated. More importantly, at least 10 percent of those were considered to be fully susceptible to infection. Yet the elimination threshold had been met meaning a larger number of children – even those without proper protection – were possibly protected.