Pfizer says trials suggest its coronavirus vaccine is 90% effective
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Pfizer says trials suggest its coronavirus vaccine is 90% effective

Pfizer says trials suggest its coronavirus vaccine is 90% effective

U.S. drugmaker Pfizer said Monday that human trials suggest its coronavirus vaccine is 90% effective at preventing COVID-19 infections in people not known to have had the virus already. Dr. David Agus joins “CBS This Morning” to discuss what this means and what is expected to happen next.

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