Polio Vaccine Poster - 搜索图片

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The New York Times
New Polio Strains That Protect Vaccine Factory Workers - The New York Times
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Wikimedia
File:Polio vaccine poster.jpg
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nytimes.com
2 Polio Paralysis Cases in Nigeria Set Back Eradication Effort - The New York Times
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foxnews.com
Nigerian helicopters rush polio vaccines to dangerous area | Fox News

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immunology.org
Polio vaccination | British Society for Im…
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BBC
In pictures: The history of polio - BBC News
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BBC
History of polio - BBC News
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Acsh.org
Testing the Polio Vaccine | American Council on Sci…

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