| Summary: | A report on the coronavirus mutations, called variants, which are being closely monitored and studied for new health threats. With the emergence of the U.K. variant and high rates of infection, scientists face a new series of quickly evolving challenges. Includes interviews with Smruthi Karthikeyan, an environmental engineer; Kristian Andersen, infectious disease researcher at Scripps Research; Dr. Francis Collins, director of the National Institutes of Health; Dr. Ghady Haidar, infectious disease specialist at the University of Pittsburgh Medical Center; Paul Duprex, a virologist at the University of Pittsburgh; and Dr. David Ho, an AIDS researcher and virologist at Columbia University Irving Medical Center.
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