Immunization

Immunization is the process whereby a person is made immune or resistant to an infection, typically by the administration of a vaccine. Vaccines stimulate the body’s own immune system to protect the person against subsequent infection.

Immunization is a proven tool for controlling and eliminating life-threatening infectious diseases and is estimated to avert over 2 million deaths each year. It is one of the most cost-effective health investments, with proven strategies that make it accessible to even the most hard-to-reach and vulnerable populations. It has clearly defined target groups; it can be delivered effectively through outreach activities; and vaccination does not require any major lifestyle change.

In the field of immunization, WHO's roles and responsibilities include:

• supporting and facilitating research and development;
• improving the quality and safety of vaccines;
• developing policy recommendations and strategies for optimizing the use of and maximizing access to vaccines;
• facilitating reduction of financial and technical barriers to the introduction of vaccines and technologies;
• supporting countries in acquiring the skills and developing the infrastructure needed to expand immunization services delivery and achieve disease control and eradication;
• providing technical assistance where needed;
• developing and maintaining collaboration between partners; and
• monitoring global progress towards the achievements of immunization goals.