T. Jacob John, a former professor of clinical virology an the Christian Medical College in Vellore, India, who has served on several Global and National Committees on Immunization and Polio Eradication, writes in this opinion piece in India’s Hindu, “While one year has passed without polio caused by natural poliovirus, we can claim complete eradication only after we ensure the absence of wild and vaccine polioviruses in the population.” He provides a brief history of polio eradication efforts, globally and in India, and continues, “For certification of eradication, two more years should pass without any case of wild virus polio. … We must continue working as if we still have poliovirus lurking somewhere, only to show up when least expected” (1/8).