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Depuis, au moins 2,5 milliards d'enfants ont été vaccinés dans le monde, et le nombre de cas a chuté de plus de 99 %, passant de plus de 1 000 cas par jour en 1988 à 650 cas au cours de l'année 2011. À l'heure actuelle, la maladie demeure endémique dans trois pays seulement – le Nigéria, le Pakistan et l'Afghanistan – et, en date de novembre 2012, seulement 17 pays ont signalé de nouveaux cas.
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Since then, at least 2.5 billion children throughout the world have been immunized against the disease. The number of cases has declined by more than 99 percent, from over 1,000 cases reported each day in 1988 to 650 cases reported for the year in 2011. The disease currently remains endemic in just three countries―Afghanistan, Nigeria and Pakistan―and, as of November 2012, only 7 countries reported new cases in the past year. Thanks to immunization, more than 5 million people have been saved from paralysis and are walking today.
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