Measles Immunization in a Northeastern Metropolitan County

441. Determination of measles immunity after a mass immunization campaign

“…Lennon Despite our finding that only about half of the susceptible children had been immunized during the campaign, the program had a dramatic effect on the incidence of measles. The reported number of measles cases fell by a factor of 10 in the year after the campaign as compared with the previous year, even if the rubella cases mistakenly reported in the followup period were not excluded. The most likely explanation for this dramatic decrease is herd immunity.…”