title: Comparative study of the acquisition of antibody to Norwalk virus in pediatric populations.
abstract: Analysis by radioimmunoassay of pediatric sera from three populations showed that antibody to Norwalk virus is acquired at a significantly earlier age in a less developed and tropical area (Philippines) than in two more developed and nontropical countries (United States and Taiwan).
mesh_terms: D000367:Age Factors; D000914:Antibodies, Viral / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010679:Philippines; D011336:Probability; D011863:Radioimmunoassay; D012209:Rhabdoviridae / Q000276:immunology*; D013624:Taiwan; D014481:United States
chemical_list: D000914:Antibodies, Viral