Door-to-door polio vaccination campaign launched in Karachi, Pakistan

Source: Xinhua| 2020-12-04 15:12:57|Editor: huaxia
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A health worker marks the finger of a child after giving polio vaccine during a door-to-door polio vaccination campaign in southern Pakistani port city of Karachi on Dec. 3, 2020. (Xinhua/Ahmad Kamal)

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