The Trump administration officially declared the coronavirus outbreak in China a “public health emergency” during a Friday afternoon press conference at the White House:

According to the briefing, there are 6 confirmed cases in the U.S. and “the risk, at this time, to the American public is low”:

But there are “unknowns”:

Starting at 5 p.m. on Sunday, U.S. citizens returning from Hubei province in China will be subject to a 14-day quarantine:

Those returning from other parts of China will be screened and be subject to up to 14 days of “monitored self-quarantine”:

And foreign nationals who’ve “traveled to China within the last 14 days will be denied entry” (with some exceptions):

To put this in perspective: