World health organization

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Polio vaccination along the Afghanistan-Pakistan border

Vaccinator checking a child's finger for vaccination mark
WHO/Chris Black

The vaccinators stop each child under the age of 5 and look for markings on the finger to indicate recent vaccination. If there is no mark, the child is immediately vaccinated. With teams on both sides of the border, each child is checked at least twice – at arrival and departure, regardless of where the journey started.

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