A girl receives polio vaccine drops at the doorstep of her family home in Karachi, Pakistan, Feb. 15, 2016. More than 100,000 health workers fanned out across Pakistan on Monday, stepping up a drive to eliminate the polio virus this year from one of its last bastions, despite continuing militant threats to vaccination teams. (REUTERS/Akhtar Soomro)
Photos of the day - February 15, 2016
http://news.yahoo.com/photos/photos-of-the-day-february-15-2016-slideshow/photos-of-the-day-february-15-2016-photo-1455557286447.html
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脊髓灰質炎疫苗（英語：Polio vaccines）又稱小兒麻痺疫苗
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