How vaccines crushed polio in the US in the mid 1950s and measles in Nigeria after 2005. economist.com/graphic-detail… https://t.co/f3AsZRcEVV

How vaccines crushed polio in the US in the mid 1950s and measles in Nigeria after 2005.
economist.com/graphic-detail… https://t.co/f3AsZRcEVV

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