The US Centers for Disease Control and Prevention has listed 398 people under investigation for the novel coronavirus in 37 states, according to an update posted to the agency's website on Monday.
Of them, 12 have tested positive, 318 negative and 68 are still pending.
These numbers are cumulative since Jan. 21 and include people with a travel history to China, as well as those who have been in close contact with confirmed cases or other people under investigation.
Pending cases include specimens that have been received and not yet undergone testing, as well as those in transit to CDC from health authorities in various states.
There are 12 confirmed cases of the novel coronavirus in the United States. Six cases have been confirmed in California, one in Massachusetts, one in Washington state, one in Arizona, one in Wisconsin and two in Illinois. This includes two instances of known person-to-person transmission, one in Illinois and one in California.
Previously, there were 337 people under investigation in 36 states as of Feb. 6, including 12 positive, 225 negative and 100 pending cases.