"More than 100 staffers from the US Centers for Disease Control and Prevention are being deployed to three US airports to check passengers arriving from Wuhan, China, for fever and other symptoms of a mysterious new virus that's killed two and infected dozens in China, the CDC announced Friday."
https://www.cnn.com/2020/01/17/healt...-bn/index.html

So what happens if passengers refuse screening? From my understanding as American citizen I can't be forced to undergo screening unless it can be established that i am danger to myself or others.