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Harvard T.H. Chan School of Public Health’s Barry Bloom, Joan L. and Julius H. Jacobson Research Professor of Public Health, offers context about the news that two experimental vaccines appear to confer a high level of protection from the coronavirus.

Q&A: Barry Bloom

CHAN SCHOOL: Within the space of a week, we’ve heard about not one, but two potentially extremely effective coronavirus vaccines—one from Pfizer/BioNTech, reportedly 90 percent effective, and now one from Moderna, nearly 95 percent effective. How encouraged should we be about these preliminary results?

BLOOM: I think we have to be very grateful that