Immunisation levels.
D003201:Computers; D004165:Diphtheria / Q000517:prevention & control; D004739:England; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D007231:Infant, Newborn; D011051:Poliomyelitis / Q000517:prevention & control; D014917:Whooping Cough / Q000517:prevention & control