Supplementary Immunization Activity (SIA) Calendar

This calendar displays historical and planned Supplementary Immunization Activities for Polio. Dates may change according to country operational planning needs.

The Regions, Countries, Vaccines, and SIA lists are multiselect-enabled: You are free to select any combination of items.


WHO’s immunization monitoring group publishes a wider Supplementary Immunization Activity calendar. It contains the information shown here alongside SIAs for other diseases and nutritional supplements.