What happens to passengers who are identified as having a fever when entering the US?

Let's say one is flying into SFO tomorrow from China and encounters one of the thermal scanners as they leave the aircraft. This passenger has a fever, which may or may not be caused by the Wuhan coronavirus. How would the airport authorities deal with such a passenger?

Some bonus questions:

• Does it matter if you're a US citizen? E.g. would they just deport a French national to avoid the risk?
• Does it matter if you have health insurance? Would the government authorities pay for any mandatory procedures or is that up to the passenger?
• Does it matter if the fever started before or during the flight? Would the passenger be prosecuted if they board the plane while knowing they're having flu-like symptoms?

Creating this question as the US authorities are currently expanding their screening of international passengers, so it's very much relevant.