U.S. Declares Public Health Emergency, Confirms 20 Cases Around the Country

"It would be an Olympic sprint for vaccine manufacturers, starting today" to have a usable vaccine ready even by October, he said.

"If this is a virus that is sufficiently new -- and that has not been entirely determined yet -- we may need two doses of the vaccine to get protection," Schaffner said. "That, of course, would put additional strain on the vaccine production and delivery services."

ABC News' Dan Childs and Matt Hosford contributed to this report.

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