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Global epidemiology of vaccine-derived poliovirus 2016–2021: A descriptive analysis and retrospective case-control study - eClinicalMedicine
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World Health Organization (WHO) on Twitter: "#Polio cases worldwide: 1988: 350000 2016: 27 That's a ⬇ of more than 99.9% #VaccinesWork! Let's #EndPolio #WorldPolioDay https://t.co/bvvHTOFA7b" / Twitter
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