[The virus antibody level in premature and newborn infants].
D006801:Humans; D007223:Infant; D007231:Infant, Newborn / Q000276:immunology; D007234:Infant, Premature / Q000276:immunology*; D009107:Mumps / Q000276:immunology*; D009975:Orthomyxoviridae / Q000276:immunology*
INFANT, NEWBORN/immunology; INFANT, PREMATURE/immunology; INFLUENZA VIRUSES/immunology; MUMPS/immunology