Nigeria, May 3 -- Reaching every unvaccinated child and preventing the spread of circulating vaccine-derived poliovirus type 2 (cVDPV2) remains a persistent challenge for Nigeria's health system.

Despite years of interventions, gaps in routine immunisation coverage persist, especially among "zero-dose" children who have never received a single vaccine.

According to the United Nations Children's Fund (UNICEF), Nigeria currently has the world's highest number of unvaccinated children. An estimated 2.1 million Nigerian children under the age of one, representing 24 per cent of the country's 8.7 million under-one population, have not received any routine vaccines.

Speaking with PT Health Watch, Christiana Fashola, a global digital health a...