Patient Nina Pham is hugged by Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, outside of the National Institutes of Health in Bethesda, Md., on Friday. Pham was discharged after testing free of Ebola. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

National Institute of Allergy and Infectious Diseases Director Dr. Anthony Fauci said a voluntary halt to bird flu research should stay in effect. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images