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The exercise, which will begin in Cameroon, Chad and Niger before being extended to the Central African Republic next week, comes in response to 19 detections of type-2 polioviruses in the countries; 2 in Niger, 10 in Chad, 4 in Central Africa Republic and 3 in Cameroon.

The multi-country initiative is supported by the World Health Organization (WHO), through the Global Polio Eradication Initiative (GPEI), and comprises synchronized vaccinations and joint plans in border communities to halt polio transmission.

鈥淭his is a crucial undertaking to close vaccination gaps in the wake of the COVID-19 pandemic and will provide millions of children with vital protection from the risk of irreversible polio paralysis,鈥� said Dr Matshidiso Moeti, WHO Regional Director for Africa. 鈥淪ynchronizing the campaign will ensure that a large cohort of children across the four countries receive the vaccine at the same time to enhance polio immunity in a broad geographic area.鈥�

The Lake Chad basin region is grappling with one of the world鈥檚 most protracted incidents of armed violence. It is also home to one of the highest proportions of so-called 鈥渮ero dose鈥� children globally, who are either unvaccinated or under-vaccinated.

This is a crucial undertaking to close vaccination gaps in the wake of the COVID-19 pandemic and will provide millions of children with vital protection from the risk of irreversible polio paralysis. Synchronizing the campaign will ensure that a large cohort of children across the four countries receive the vaccine at the same time to enhance polio immunity in a broad geographic area

All the four countries have made huge efforts to bolster polio detection, curb the spread of the virus and protect children from the risk of infection and lifelong paralysis. However, despite all being certified free of indigenous wild poliovirus听 ongoing circulating variant poliovirus type 2 persists.

Across the countries, governments have continued to improve the quality of immunization activities, bolstered by the broad implementation of supplementary immunization campaigns. These are targeted at addressing the residual risks for all forms of poliovirus, while also boosting routine immunization at country level.

In addition, door-to-door implementation has eased the burden on parents to transport their children to health facilities for vaccination. Health workers, with support from WHO, are now also administering vaccines in homes, as well as at religious centres, markets and schools.

Religious and community leaders, as champions of poliovirus eradication, also help to mobilize caregivers to vaccinate their children against not only polio, but all preventable diseases.

Door-to-door implementation has eased the burden on parents to transport their children to health facilities for vaccination. Health workers, with support from WHO, are now also administering vaccines in homes, as well as at religious centres, markets and schools.

Importantly, reliable data is crucial for effective disease surveillance and outbreak response. In the wake of the ongoing outbreaks of circulating variant poliovirus, countries have also stepped up surveillance to detect cases.

鈥淭he use of Geographic Information Systems tools, including Open Data Kit, is also accelerating the response to alerts of potential polio cases, helping curb the spread of the virus,鈥� said Dr Richelot Ayangma, GPEI lead in West and Central Africa.

WHO, Rotary International, the United Nations Children鈥檚 Fund (UNICEF), Gavi, the Vaccine Alliance, the Bill & Melinda Gates Foundation, along with the US Centers for Disease Control and Prevention, have also joined forces behind 鈥淭he Big Catch Up鈥�. This is a targeted global effort to boost essential immunization among children following declines driven by the COVID-19 pandemic.

WHO is supporting countries on the continent to protect all children against all forms of polio.