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American Journal of Epidemiology Vol. 150, No. 11: 1250-1257
Copyright © 1999 by The Johns Hopkins University School of Hygiene and Public Health

other

Measles Epidemic in Romania, 1996–1998; Assessment of Vaccine Effectiveness by Case-Control and Cohort Studies

Karen A. Hennessey1,2, Nicolae lon-Nedelcu3, Maria-Dorina Craciun3, Flores Toma3, Wendy Wattigney4 and Peter M. Strebel1

1Vaccine-Preventable Disease Eradication Division, National Immunization Program, Centers for Disease Control and Prevention (CDC) Atlanta GA
2Epidemic Intelligence Service, Epidemiology Program Office CDC Atlanta, GA
3Expanded Program on Immunization, Ministry of Health Bucharest, Romania
4Data Management Division, National Immunization Program, CDC Atlanta, GA

Reprint requests to Information Services (E-34), National Immunization Program, CDC, Atlanta, GA 30333.

A measles epidemic occurred in Romania with 32, 915 cases and 21 deaths reported between November 1996 and June 1998, despite high vaccination coverage since the early 1980s. Most cases were unvaccinated children aged<2 years and vaccinated school children. A case-control study among preschool children and a cohort study among primary-school children were conducted to eslimate effectiveness of Romanian produced measles vaccine, and to evaluate age at vaccination and waning immunity as risk factors for vaccine failure. Both studies indicated that measles vaccine was highly effective. One dose reduced the risk for measles by 89% (95% onfidence interval (CI) 85, 91); two doses reduced the risk by 96% (95%CI 92, 98). Children vaccinated at <1 year of age were not at increased risk for measles compared with children vaccinated at {uparrow}1 year. Warning immunity was not identified as a risk factor since vaccint effectiveness was similar for children vaccinated 6–8, 9–11, and 12–14 years in the past. Because specific groups were not at risk for vaccine failure, an immunization campaign that targets all school-aged children who lack two doses may be an effective strategy for preventing outbreaks. A mass campatign followed by increased first-dose coverage should provide the population immunity required to interrupt indigenous measles virus transmission in Romania. Am J Epidemiol 1999; 150; 1250–7.

disease outbreaks; immunity; immunization programs; measles; measles vaccine; vaccination


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