2016年5月24日 星期二

Polio vaccine, 脊髓灰質炎疫苗

Shahzaib Akber/EPA
Police guard a polio vaccination team, during a three-day vaccination campaign in Karachi. Pakistan. Though new polio cases dropped to a nine-year low in 2015, attacks by Islamist militants against health workers and police guarding them remained a challenge for a UN-funded vaccination campaign.
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Polio vaccine - Wikipedia, the free encyclopedia

脊髓灰質炎疫苗

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