title: Humoral immunity factors to parainfluenza viruses type 1, 2 and 3 in infants under the age of one year.
mesh_terms: D000906:Antibodies / Q000032:analysis*; D000917:Antibody Formation; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007112:Immunity, Maternally-Acquired; D007223:Infant; D007231:Infant, Newborn; D008431:Maternal-Fetal Exchange; D018184:Paramyxoviridae Infections / Q000276:immunology; D011247:Pregnancy; D018108:Respirovirus / Q000276:immunology*
chemical_list: D000906:Antibodies