![A Pakistani health worker administers polio vaccine drops to a child during a door-to-door polio campaign in Karachi on September 26, 2016.
Pakistan is one of only three countries in the world where polio remains endemic but years of efforts to stamp it out have been badly hit by reluctance from parents, opposition from militants and attacks on immunisation teams. / AFP PHOTO / RIZWAN TABASSUM](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/GGAZZG75OFZKNMIM32EDJXVI5A.jpg?smart=true&auth=5d6011d209b0df7bac83cbc3de0d943779ba43455e82fe7f934e25437c0c75f0&width=400&height=225)
A health worker administers polio vaccine drops to a child during a door-to-door polio campaign in Karachi. Rizwan Tabassum / AFP
A health worker administers polio vaccine drops to a child during a door-to-door polio campaign in Karachi. Rizwan Tabassum / AFP
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