[The childhood vaccination program. Background, status and future].

Surveillance of the Danish childhood immunization programme has taken place at Statens Seruminstitut since 1980. A description of the prevalence of the diseases, which are included in the programme, is presented. The Danish childhood immunization programme has for many years been one of the best in the world although it differs markedly from other countries. The polio immunization programme with inactivated polio vaccine given first and then later live attennuated vaccine is probably the optimal polio immunization programme. The childhood immunization programme began in 1943 with free diphtheria vaccination, and tetanus immunization was added in 1949. There was a big polio epidemic in 1952/53 and the polio vaccine was introduced in 1955. All three vaccines have markedly reduced the prevalence of these diseases. Pertussis vaccine was introduced in 1961 and measles, mumps and rubella vaccination in 1987. Vaccination against Haemophilus Influenzae type b was introduced with success in 1993. In the future several changes will probably be made in the programme because of the possibility using new combined vaccines.