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Dr. Gupta explains Pfizer’s 95% effectiveness rate

Pharmaceutical company Pfizer revealed a 95% effectiveness rate for their coronavirus vaccine and will be submitting for FDA authorization within days. CNN’s Sanjay Gupta reports.

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Pharmaceutical company Pfizer revealed a 95% effectiveness rate for their coronavirus vaccine and will be submitting for FDA authorization within days. CNN’s Sanjay Gupta reports.

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