Rotarians play a key role in National Immunisation Days by mobilizing to deliver vaccines to hundreds of thousands of children across remote regions, travelling by various means of transportation to set up over 700,000 vaccination booths staffed by 1.17 million vaccination teams administering 225 million doses of polio vaccine kept cold by 6.3 million ice packs to visit 209 million homes and immunize 172 million children in a single event in India.