Prevalence of neutralizing antibodies against polioviruses in unvaccinated children.
D000914:Antibodies, Viral / Q000032:analysis*; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D017955:Poliovirus / Q000276:immunology*; D014611:Vaccination
D000914:Antibodies, Viral