Immunization Campaigns

The utilisation of vaccination campaigns as a delivery method allows for the rapid administration of one or more vaccinations to a large number of children and/or persons. Depending on the requirements and goals of the country, they can be undertaken at the national or subnational level, using a single antigen or in combination. Various immunisation programmes exist, including: Regardless of a person's vaccination status, supplemental immunisation campaigns and activities (SIAs) administer vaccinations to all persons who are targeted (prior history). To achieve disease control or eradication goals, a quick increase in population-level immunity and a decrease in the number of susceptibles are required. Developing and Putting into Practice High-Quality Supplementary Immunization Activities (SIAs) for Injectable Vaccines Periodic Intensification of Routine Immunization (PIRI) is a term used to describe a range of time-limited, irregular activities or campaigns intended to provide standard vaccines to people who are either under-vaccinated and/or promote the advantages of vaccination. PIRIs can take many different shapes; a few include National Vaccination Weeks, Child Health Weeks, and Child Health Days. Individuals are screened for eligibility based on age and immunisation history, and the doses administered are recorded on vaccination cards and registers, as well as included in national administrative coverage figures. By definition, the vaccine doses provided during a PIRI activity are considered routine, rather than supplemental.