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American Journal of Epidemiology Vol. 122, No. 2: 208-217
Copyright © 1985 by The Johns Hopkins University School of Hygiene and Public Health

research-article

CONTINUING MEASLES TRANSMISSION IN STUDENTS DESPITE A SCHOOL-BASED OUTBREAK CONTROL PROGRAM

STEVEN G. F. WASSILAK1,, WALTER A. ORENSTEIN1, PEGGY L. STRICKLAND2, CAROL A. BUTLER2 and KENNETH J. BART1

1Division of Immunization, Center for Prevention Services, Centers for Disease Control Atlanta, GA 30333
2Acute Infectious Disease Division, Commonwealth of Pennsylvania Department of Health Harrisburg, PA

Reprint requests to Dr. Steven G. F. Wassilak

From September 9, 1981 to January 5, 1982, a measles outbreak occurred in Warren County, Pennsylvania. The outbreak persisted for nine weeks following the implementation of a county-wide outbreak control program primarily consisting of identifying and vaccinating susceptible schoolchildren. Forty-six cases occurred among students more than two weeks after control program implementation. All 46 had a school record indicating adequate measles vaccination; 13 had been vaccinated at control program clinics by one jet-injector team (Team A). A seroprevalence survey demonstrated that persons vaccinated by Team A had a significantly higher rate of vaccination failure than children vaccinated by other teams (37.0% vs. 5.9%, p=5.7x10–7). A case-control study was undertaken to assess possible additional risk factors for developing measles. Individuals with measles were nine times more likely than control individuals to have records of measles immunization that could not be verified with providers or to have been vaccinated at 12 months of age. The most likely reasons that this outbreak was sustained among persons with adequate vaccination histories were: 1) impotent vaccines and/or improper vaccine administration techniques were used by one jet-injector team; 2) several persons with histories of adequate vaccination were really not adequately vaccinated; and 3) a substantial number of persons had been vaccinated at 12 months of age. There is no evidence from this outbreak that transmission of measles can be sustained among the 2–10% of individuals expected to remain susceptible following a single appropriate measles vaccination.

communicable disease control; eoidemiologic methods; immunization; measles; medical records; vaccination; vaccines


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