Y'beat me to it. I was going to ask if they can identify the disease in real time, or only after the airport workers start dropping like flies three weeks later.
Doesn't it seem unlikely that they'll be doing blood tests on all entrants to the country? So, in that case, they'll only test high-probability carriers... and they're bound to miss a few. It will be CDC people ably helped by DHS personnel, /S.
Sure, as if every passenger will willing submit to a blood test or any other delay. Let’s see them try stopping the likes of a Sheila Jackon Lee at an airport. Some animals are more equal than others.