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Six new cases were reported in the past week (five type WPV1 cases and one type WPV3 case). All six of the cases had onset of paralysis in 2012 (three from Kano, two from Sokoto and one from Zamfara), bringing the total number of cases in 2012 to 23. The most recent cases had onset of paralysis on 23 March (a WPV1 from Kano and a WPV3 from Kano).
(Via WHO Global Polio Eradication - accessed 23/04/12)
Advice for Travellers
It is recommended that travellers have a poliomyelitis booster (or course) if not already protected and take precautions with food, water and personal hygiene.