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Variation in Antibody Response to Oral Polio Vaccines Amongst Children
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Topics: OPV Oral Polio Vaccine Seroconversion

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Roland W Sutter, Peter A Patriarca, Ali Jaffer M Suleiman, Mark A Pallansch, Elizabeth R Zell, Pradeep G Malankar, Shaun Brogan, Ahmed A K Al-Ghassani And Musallam S El-Bualy. Paralytic Poliomyelitis In Oman: Association Between Regional Differences In Attack Rate And Variations In antibody Responses To Oral Poliovirus Vaccine. International Journal Of Epidemiology, 1993, Volume 22, Number 5, Pp. 936-944.

Division of immunization (EO5) Atlanta, GA 30333, USA Ministry of health Muscat, Oman

Division of Viral and Rickettsial Diseases, Centers for disease Control Atlanta, GA 30333, USA

Reprint requests to: Information Services, National Center for Prevention Services (EO7), Centers for disease Control, Atlanta, GA 30333, USA

Variation in attack rates of paralytic disease by region during the 19881989 epidemic of type 1 poliomyelitis in Oman provided the stimulus to test the hypothesis that these observations were due to regional differences in the response of infants to trivalent oral poliovirus vaccine (OPV). Seroprevalence studies of 394 children born during the outbreak were conducted in six different regions of Oman and in two socioeconomic status (SES) groups in the capital city of Muscat; a seroconversion study was also carried out in 105 infants born after the outbreak. Seroprevalence rates by region after receipt of at least three doses of OPV ranged from 90% to 100% (median 94%) to poliovirus type 1, and from 86% to 100% (median 97%) to type 2, and from 47% to 79% [median 72%) to type 3, with the lowest rates observed in regions with the highest incidence of type 1 paralytic disease. In Muscat, seroprevalence rates were also significantly lower in low versus high SES groups (type 1: 84% versus 98%. respectively [P = 0.006]; type 3: 59% versus 86%. respectively [P = 0.001]). In the seroconversion study conducted after the outbreak, 89%. 100% and 50% of infants had detectable antibodies to types 1, 2, and 3, respectively, after four doses of OPV. Low responses to type 3 were also associated with the occurrence of sporadic cases of type 3 poliomyelitis in 1991, in spite of high rates of coverage with at least four doses of OPV (>96%) throughout the country. These findings demonstrate that antibody responses to OPV may vary widely within individual countries, and that a uniform strategy to deliver at least three doses in routine programmes may be insufficient to achieve elimination of wild poliovirus infection.

You may also want to see the following relevant article that highlights a similar issue: Vaccine Policy Lags Behind vaccine Science

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