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CBS Evening News | U.K. "challenge" trials will infect volunteers with COVID

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U.K. "challenge" trials will infect healthy volunteers with COVID-19

2min
As the world surpasses 40 million confirmed coronavirus cases, there is now a call for volunteers in the U.K. willing to be infected with the virus in the first-ever COVID-19 "challenge" trial. Elizabeth Palmer reports. Air Date: Oct 20, 2020
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