US not ready to declare coronavirus a public health emergency: HHS
Even if that asymptomatic transmission is confirmed, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, stressed that asymptomatic transmission is not health officials' primary concern.
"In all the history of respiratory viruses, asymptomatic transmission has never been the driver of outbreaks," Fauci said. "An epidemic is not driven by asymptomatic carriers."
上面是1月28日ABC News 的文章,这是因为1月26日中国向全世界通告病毒在潜伏期即具传染力