Nigeria, Aug. 29 -- A vaccine-derived strain of the poliovirus is still circulating in parts of Nigeria's North West, raising concern that the country's hard-won progress against the disease could be undermined.

The Gombe State Governor, Inuwa Yahaya, raised the concern on Thursday while briefing journalists after the National Economic Council (NEC) meeting presided over by Vice President Kashim Shettima.

Mr Yahaya recalled that the National Committee on Polio Eradication, inaugurated in December 2023, has been holding regular sessions to assess progress and refine strategies.

He stressed that while Nigeria was declared free of wild poliovirus in 2020, the challenge now is the variant strain spreading across Kano, Katsina, Kebbi, Sokot...