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Exclusive: U.S. to make coronavirus strain for possible human challenge trials Yahoo NewsThe U.S. has already invested billions in potential coronavirus vaccines. Here's where the deals stand CNBCUS will prepare coronavirus strain for potential human challenge trials MSN MoneyReport: US exploring possibility of controversial 'challenge trial' for COVID-19 vaccine | TheHill The HillChina Sinopharm's potential COVID-19 vaccine triggers antibodies in clinical trials: journal ReutersView Full Coverage on Google News