In a briefing with reporters Thursday, CDC Director Robert Redfield said surveys of blood samples taken from around the country suggest that millions of Americans may have contracted the virus either without knowing it or with only minimal symptoms.
For every one confirmed case, Redfield said, the CDC estimates that 10 more people have been infected.
"This virus causes so much asymptomatic infection," Redfield said. "We probably recognized about 10 percent of the outbreak."
For every one confirmed case, Redfield said, the CDC estimates that 10 more people have been infected.
"This virus causes so much asymptomatic infection," Redfield said. "We probably recognized about 10 percent of the outbreak."

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