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June 5, 1996

Seroprevalence of Antibody Against Poliovirus in Inner-city Preschool ChildrenImplications for Vaccination Policy in the United States

Author Affiliations

From the National Immunization Program (Drs Chen and Patriarca and Mr Baughman) and Division of Viral and Rickettsial Diseases (Dr Pallansch), Centers for Disease Control and Prevention, Atlanta, Ga; Section of Academic Ambulatory Pediatrics, Baylor College of Medicine, Houston, Tex (Drs Hausinger and Hanfling); and Department of Pediatrics, Wayne State University School of Medicine and Division of Infectious Diseases, Children's Hospital of Michigan, Detroit (Dr Dajani). Dr Patriarca is now with the Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Md.

JAMA. 1996;275(21):1639-1645. doi:10.1001/jama.1996.03530450029028

Objective.  —To assess susceptibility to poliomyelitis in selected inner-city preschool children in the United States and to estimate the contribution of secondary spread of live attenuated oral poliovirus vaccine virus to type-specific immunity.

Design.  —Cross-sectional seroprevalence study.

Methods.  —Serum neutralizing antibody levels against poliovirus types 1,2, and 3 were analyzed according to vaccination status, age, and other sociodemographic variables.

Setting.  —Hospital and satellite clinics serving inner-city populations in Houston, Tex, and Detroit, Mich, 1990 to 1991.

Participants.  —A total of 526 children aged 12 to 47 months seeking medical care were enrolled in the seroprevalence study; 144 children aged 12 to 35 months without a history of previous oral poliovirus vaccination were enrolled in the secondary spread study.

Results.  —Seropositive rates were similar in children in both cities, ranging from about 80% for types 1 and 3 in 12- to 23-month-old children to more than 90% in those aged 36 to 47 months. The most important predictor of seropositivity was the number of doses of oral poliovirus vaccine received (P<.01), with levels approximately 90% for all 3 serotypes among children who had received 3 or more doses. In children likely to have been unvaccinated, seropositive rates ranged from 9% to 18% for poliovirus types 1 and 3 and from 29% to 42% for type 2; secondary spread of vaccine virus appeared to have occurred among children who had previously received 1 dose or less but not those with 2 or more doses.

Conclusions.  —Levels of immunity to poliovirus among inner-city preschoolers are high and may be predicted by the number of doses of oral poliovirus vaccine received. Secondary spread of the vaccine virus plays a modest role in increasing polio immunity in inner-city populations, especially against types 1 and 3. This role will decrease in importance if the recently attained high levels of immunization coverage in the United States are sustained and if the risk of importation of wild poliovirus continues to diminish.(JAMA. 1996;276:1639-1645)