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In this undated frame from video provided by the National Institute of Allergy and Infectious Diseases (NIAID), a scientist returns a novel coronavirus vaccine sample to a freezer in Bethesda, Md. The flu-like virus that exploded from China has researchers worldwide once again scrambling to find a vaccine against a surprise health threat, with no guarantee one will arrive in time. (NIAID via AP)

In this undated frame from video provided by the National Institute of Allergy and Infectious Diseases (NIAID), a scientist returns a novel coronavirus vaccine sample to a freezer in Bethesda, Md. The flu-like virus that exploded from China has researchers worldwide once again scrambling to find a vaccine against a surprise health threat, with no guarantee one will arrive in time. (NIAID via AP)

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