No, you don't need a polio booster shot if you've been vaccinated | cbs8.com
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Do You Need a Polio Vaccine Booster?
Was I vaccinated for polio?' and other questions, answered
Do you need a polio booster shot? Everything you need to know about polio vaccines
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All children aged 1-9 in London to be offered urgent polio booster - Pulse Today
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Do You Need a Polio Booster Shot?
How Long Does the Polio Vaccine Last and Do You Need a Booster? | SELF
Archivo:Polio vaccine poster.jpg - Wikipedia, la enciclopedia libre
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Polio: What is it and how does it spread? - BBC News
Vaccine guarantees can help prevent the resurgence of polio - STAT
