The northern Nigerian state of Kano is not part of a new polio vaccination campaign being conducted by the World Health Organisation after health fears.
Muslim leaders in the historic city say the vaccine has been laced with anti-fertility drugs. Scientific tests in Nigeria approved the injection.
Nigeria has the world's highest number of new polio cases, centred in Kano, and it is spreading to other countries.
WHO fears that its goal of eradicating polio by 2005 is now under threat.
'US conspiracy'
Some 15 million children in West Africa are at risk of contracting polio.
The WHO is carrying out anti-polio vaccinations in the six worst affected states in Nigeria - except Kano.
Datti Ahmed, the President of the Kano-based Sharia (Islamic Law) Supreme council, has told the BBC that the vaccine is part of a United States-led conspiracy to de-populate the developing world.
The BBC's Anna Borzello in Nigeria says fears like these are now common in Kano where anti-American sentiment is on the rise.
The WHO hopes that Kano can be included in th next round of immunisation, starting in February.
Since January, there have been 74 new cases of the potentially crippling disease.
This is a 30% increase from last year, according to the WHO.
It says the disease is now spreading from Kano to other neighbouring states and neighbouring countries like Ghana, Togo, Niger and Burkina Faso.
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