The success of immunization programmes depends on their ability to be efficient and sustainable in the long term. Programme sustainability is the capacity of country immunization systems and processes to endure, without or with limited need of external financial/other support.

While some countries have made great progress in the past few years in developing their immunization programmes and introducing new vaccines, many countries are still struggling to ensure efficient and sustainable immunization programmes. Issues may be linked to several factors spanning across different areas, including: decision-making, political commitment and financial support, demand for immunization services and access to affordable and timely supply of vaccines.

WHO is playing a key role in developing the sustainability of immunization programmes, working closely with immunization partners.