'This is a very fast moving, constantly changing situation,' Health and Human Services Secretary Alex Azar said.
Most respiratory illnesses are spread when an infected person has symptoms, such as coughing or sneezing.
In all the history of respiratory-borne viruses of any type, asymptomatic transmission has never been the driver of outbreaks. "The driver of outbreaks is always a symptomatic person," said Dr. Anthony Fauci, director of the National Institutes of Health's National Institute of Allergy and Infectious Diseases."Even if there is some asymptomatic transmission, in all the history of respiratory-borne viruses of any type, asymptomatic transmission has never been the driver of outbreaks.
Cases in China are rising daily. As of late Tuesday, there were at least 5,974 confirmed cases in that country, and at least 132 deaths, Chinese health officials said.. In addition to the five U.S. cases, others have been diagnosed in Australia, Cambodia, Canada, France, Germany, Hong Kong, Japan, Nepal, Singapore, South Korea, Thailand and Vietnam.
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