Nigeria’s continuing diphtheria outbreak is a grim reminder that preventable diseases can become deadly when public-health systems fail to sustain basic immunisation. The Nigeria Centre for Disease Control and Prevention (NCDC) says more than 10,000 confirmed cases have been recorded in 2026, with Kano, Borno and Bauchi among the worst-affected states. The figures are particularly disturbing against the cumulative burden. Since the outbreak began in 2022, Nigeria had recorded 65,759 suspected cases and 2,229 deaths by March 22, 2026. Kano alone has subsequently reported 32,633 confirmed cases and about 1,747 deaths since 2022. Plateau, Niger and other states have also reported fresh outbreaks and fatalities, while the Federal Capital Territory (FCT) has confirmed five laboratory-confirmed cases, including two deaths.
Diphtheria is a highly contagious bacterial disease caused principally by toxin-producing Corynebacterium diphtheriae. It commonly attacks the throat and airways, producing a thick membrane that can obstruct breathing. Its toxins can damage the heart, nerves and other organs, making delayed treatment potentially fatal. It is not confined to Nigeria: sustained transmission and outbreaks occur in parts of Africa and other regions where immunisation gaps persist. The World Health Organization reported Nigeria among eight African countries with diphtheria outbreaks since the beginning of 2025. Although transmission can occur throughout the year, outbreaks tend to intensify when susceptible populations accumulate, particularly where routine immunisation is disrupted. Children who are unvaccinated or incompletely vaccinated, especially those in overcrowded, displaced, impoverished or hard-to-reach communities, are at greatest risk. Alarmingly, NCDC data showed that only 14.3 per cent of confirmed cases in its earlier cumulative dataset had been fully vaccinated against diphtheria.
The Federal Government, through NCDC and partners, is conducting surveillance, case detection, laboratory investigation, vaccination campaigns, contact tracing and treatment support. State governments are undertaking community mobilisation, vaccination and awareness campaigns, while humanitarian partners have supported treatment and mass immunisation in severely affected areas. But emergency campaigns cannot substitute for functioning routine immunisation. Governments must urgently identify zero-dose and partially immunised children, intensify door-to-door and community vaccination, restore confidence through trusted traditional, religious and community leaders, and ensure vaccines reach IDP camps, nomadic settlements and insecure communities. Primary healthcare centres require adequate personnel, antitoxins, antibiotics, laboratory capacity and referral systems.
Suspected cases must be isolated and treated promptly, while families should avoid self-medication and seek immediate medical attention for sore throat, fever, swollen neck or difficulty breathing. Above all, Nigeria must stop treating every outbreak as an emergency that begins and ends with a campaign. The real solution is to close the immunity gap permanently. A disease against which an effective vaccine exists should not continue killing Nigerian children. Arresting diphtheria therefore requires not merely fighting this outbreak, but rebuilding the routine immunisation system that prevents the next one.
