Diphtheria, tetanus, pertussis and polio vaccine for children before they start school = Difftheria, tetanws, pertwsis a pholio i blant cyn dechrau ysgol.
NHS Wales,issuing body.
Public Health Wales.
Title from cover.
"WG27148."
"This leaflet is produced by: Public Health Division, Welsh Government and the Vaccine Preventable Disease Programe, Public Health Wales.