Why does this happen? See here for a few clues.* From AP, with thanks to citybilly:
KANO, Nigeria — A suspected large-scale polio outbreak was reported Friday among children in a heavily Muslim northern Nigeria state that had boycotted immunization campaigns, and local authorities appealed for urgent action to stop the spread.
The suspected outbreak was in Kano state, one of several in northern Nigeria that had shunned polio vaccination drives over suspicions the vaccines were part of a U.S.-led plot to render Muslims sterile.
On Friday, local officials in the Kano state city of Rogo disclosed that they had recorded dozens of suspected polio cases in recent weeks. Rogo is 60 miles southeast of the state capital, also named Kano. …
In September, Shekarau suspended participation in a global immunization program on the grounds that local scientists had discovered traces of a hormone in foreign-made vaccines that they feared could make girls infertile.
Some local Islamic leaders accused the Nigerian federal government of being part of a U.S. plot to kill off Muslims with the vaccines.
*The “Arab world” part of the title was put on by the FrontPage editors. In the article I discuss general Muslim, not Arab, attitudes, which apply to Nigeria as much as they do to other Muslim areas.