As a former flight attendant, you get to finding out interesting things about each airport. At SFO, as you exit from the international terminal and you are walking on your way to customs, there is a special camera that views each and every passenger (and flight crew) for unusually high temperatures. This was in the year 2006. I worked until 2008 and it stayed the same. Im not sure if all the airports have this type of camera - but this can be considered "screening for ebola".