Herd immunity is achieved when the number of immunized individual in a given community reached a certain level so that those who are immunized create a protective barrier for others who have not been immunized. For example, vaccinating 95% of the target population in a given community against measles is sufficient to stop the measles virus transmission.
The arsenal of vaccines is growing rapidly through more advance bio-medical researches. Multiple vaccines can now be administered all at once. New preparations for vaccines are also being developed to make them more stable to freezing or heat, thereby saving cost on cold chain needs. Immunization managers operate within the context of the overall health system. Most of the time, the immunization programme provides an opportunity to integrate other health interventions so as to ensure efficient delivery of services to the people. This is particularly true during mass immunization campaign or conduct of special programmes such as Reaching the Urban Poor (RUP).
WHO Country office supports Philippine Expanded Programme on Immunization
The WHO Country Office supports the Philippine Expanded Programme on Immunization since it started. Primarily providing technical and funding assistance, the WHO supports the country on the following:
- strengthening the national immunization programme;
- strengthening the Vaccine National Regulatory Authority;
- sustaining Polio-free certification;
- achieving elimination of measles, and maternal and neonatal tetanus;
- accelerating control of Hepatitis B and Rubella;
- strengthening vaccine-preventable disease surveillance;
- supporting National Reference Laboratories for vaccine-preventable diseases; and
- introducing new and underutilized vaccines.