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    Gupta fact-checks vaccine comments by Trump, Carson

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Gupta fact-checks vaccine comments by Trump, Carson

Republican candidates Donald Trump and Dr. Ben Carson voiced their opinions on vaccines and autism during the second GOP debate. CNN's Dr. Sanjay Gupta reports.

Gupta fact-checks vaccine comments by Trump, Carson

Republican candidates Donald Trump and Dr. Ben Carson voiced their opinions on vaccines and autism during the second GOP debate. CNN's Dr. Sanjay Gupta reports.