NIH

Updated at 1:40 p.m. ET

Dr. Anthony Fauci, the country's top infectious disease expert, told members of Congress on Tuesday that although he can't predict the ultimate number of infections and deaths related to the coronavirus, "it's going to be very disturbing."

Dr. Elias Zerhouni knows the dangers of infectious disease outbreaks. He was director of the National Institutes of Health in 2005 when bird flu appeared poised to become more infectious to humans. Fortunately, that pandemic never materialized, but he says it served as a warning of what was to come.

Zerhouni has been a member of the faculty of the Johns Hopkins University School of Medicine and head of global research and development for the pharmaceutical company Sanofi.

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U.S. health officials are eliminating special regulations for gene therapy experiments, saying that what was once exotic science is quickly becoming an established form of medical care with no extraordinary risks.

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