No adverse impact due to rescheduling of polio immunisation drive: Government SECTIONS Last Updated: Mar 09, 2021, 04:23 PM IST Share Synopsis India conducts one nationwide NID, commonly known as the pulse polio immunisation programme, and two sub-national immunization days every year to maintain population immunity against the wild poliovirus and to sustain its polio-free status. Getty Images There was no adverse impact due to rescheduling of the National Immunisation Day (NID), which was successfully conducted within two weeks and more than 15.8 crore children were vaccinated, Minister of State for Health Ashwini Choubey told the Rajya Sabha on Tuesday. India conducts one nationwide NID, commonly known as the pulse polio immunisation programme, and two sub-national immunization days every year to maintain population immunity against the wild poliovirus and to sustain its polio-free status.