Hey folks, if they're not symptomatic, the disease can't spread. The people evac'd have been in suits, on chartered flights, with bods from the CDC also in suits, so there is no danger from them.
There've been ~1500 reported cases since February in West Africa. For this outbreak, the mortality rate is ~55-60%. That's in one of the most open, uncontrollable areas of the world, where all kinds of cultural and social mores bring people in close proximity to the disease and bio-security is practically nil.
Should an infected but asymptomatic person get on a flight, there would be zero danger from that person. When they become symptomatic, they are visibly ill and deteriorate rapidly. At the very least, they would appear to have a bad case of 'flu. But, unlike with 'flu, if they sneeze you will only be infected if you come into contact with blood, saliva, mucus or sweat. The Ebola variant in play here is NOT an airborne pathogen, you CAN NOT contract the disease just by breathing the same air as an infectee. Another thing, because of the nature of the disease, sufferers will basically take on the appearance of walking salami at an early stage.
Really, the biggest risk to the western world was, and still is, pneumonic plague. In both cases, it doesn't matter much whether you're strong as an ox or have ongoing health issues. The real trick is, read up on the disease, then if you come down with some sudden symptoms that seem to match, isolate yourself and seek help.
And just for your peace of mind, there was a brief outbreak of Ebola in Reston, VA in 1989. It was a mutated strain, harmless to humans (as it turned out). It's also widely reported that there's an Ebola variant (probably Ebola Reston) still doing the rounds in Pennsylvania.