Immunization of infants.
D000367:Age Factors; D002675:Child, Preschool; D004165:Diphtheria / Q000517:prevention & control; D006801:Humans; D007114:Immunization; D007115:Immunization Schedule; D007223:Infant; D008457:Measles / Q000517:prevention & control; D009107:Mumps / Q000517:prevention & control; D011051:Poliomyelitis / Q000517:prevention & control; D012409:Rubella / Q000517:prevention & control; D012899:Smallpox / Q000517:prevention & control; D013742:Tetanus / Q000517:prevention & control; D014374:Tuberculin Test; D014917:Whooping Cough / Q000517:prevention & control