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Abstract
Mesh： See more » Child, PreschoolDeveloping CountriesHumansPan American Health OrganizationPoliomyelitis/prevention & controlPoliomyelitis/transmissionPoliovirus Vaccine, Oral/administration & dosagePopulation Surveillance
Substances： See more » Poliovirus Vaccine, Oral
Year: 1992 PMID： 1419567
Source DB: PubMed Journal: Wkly Epidemiol Rec ISSN： 0049-8114