Immunization describes the whomber le process of delivery of a vaccine and the immunity it generates in an individual and population. A vaccine is a special form of a disease-causing agent (e.g., virus or bacteria) that has been developed to protect against that disease. Smallpox has been eradicated from globe by intense immunization. Poliomyelitis is to be eradicated thru pulse polio programme.
UNICEF and its partner organizations are responding to the challenge with a global push to ensure that the hardest children to reach – most of them in Africa and Asia – are immunized. Major initiatives are underway to accelerate the development and deployment of new and underused vaccines, for example hepatitis B (Hep B) and Haemophilus influenzae type b (Hib) vaccine.