Children often have a finger painted purple on vaccination day to show that they have received their vaccine.

The purple mark is commonly used in polio vaccination campaigns, particularly in countries where health workers vaccinate large numbers of children during national immunization days.

* Prevents missed vaccinations: Workers can quickly see which children have already been vaccinated.
* Prevents duplicate doses: The mark helps teams avoid accidentally vaccinating the same child twice during that campaign.
* Helps track coverage: It provides a simple visual way to monitor which children have been reached.

The purple ink is generally a temporary, skin-safe marker.

Rotarians continue to fight Polio