To the Editor.—
Dr Fraikor (234:151, 1975) asks some interesting epidemiologic questions regarding measles cases occurring in previously immunized patients. New Jersey experienced a well-documented statewide measles epidemic during the 1973-1974 school year. A vaccine efficacy study (to be submitted for publication) was conducted to ascertain if effective immunity levels were maintained for time intervals longer than reported in previous studies.1,2The results of the study done in two middle-class communities showed that in children from grades 7 through 12, the efficacy of vaccination was not significantly different from that of having had the disease. We think that these children did not receive an ineffective vaccine, as the children we studied were vaccinated over an interval of several years and by many different physicians and in many different public clinics. In our study, all the students were vaccinated when they were more than 1 year of age, which is
Ziskin LZ. Measles Vaccination. JAMA. 1976;235(12):1212. doi:10.1001/jama.1976.03260380016012
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