The Africa Regional Certification Commission has declared Nigeria and the rest of Africa polio-free.
According to the World Health Organisation (W.H.O), this marks the eradication of a second virus from the face of the continent since smallpox 40 years ago.
In a statement on Tuesday, the organisation commended donors and health workers for saving the lives of children who have been suffering from the disease.
“Thanks to the relentless efforts by governments, donors, frontline health workers and communities, up to 1.8 million children have been saved from the crippling life-long paralysis,” the WHO said in a statement.
The official announcement is due at 1500 GMT in a videoconference with WHO director-general Tedros Adhanom Ghebreyesus and key figures including philanthropist and Microsoft founder Bill Gates.
“Happiness is an understatement. We’ve been on this marathon for over 30 years,” said Tunji Funsho, a Nigerian doctor and local anti-polio coordinator for Rotary International.
He said it marked a crucial step in the total eradication of the illness at the global level.
“It’s a real achievement, I feel joy and relief at the same time,” he added.
Poliomyelitis, or “wild polio” is an acutely infectious and contagious disease that attacks the spinal cord and causes irreversible paralysis in children.
It was endemic around the world until a vaccine was found in the 1950s, though this remained out of reach for many poorer countries in Asia and Africa.
As late as 1988, the WHO counted 350,000 cases globally, and in 1996 said there were more than 70,000 cases in Africa alone.
Thanks to a rare instance of collective global effort and financial backing — some $19 billion over 30 years — only Afghanistan and Pakistan have recorded cases this year: 87 in total.