Viruses aren't technically alive, so not they really don't 'learn' in the way that was implied. Ebola doesn't share the life strategy of the colds or the flu (as a rapid changer); instead much more like mumps or measles (whic hardly ever change at all, which is why out vaccines almost never have to change). It's not classified as having aerosol transmission for several excellent reasons, including very high infectious dose & strong sensitivities to drying and inactivation by UV/sunlight. If you get directly coughed upon (aka direct transmission of fluid), you can get it. If not, then it's extremely unlikely to get an infectious dose. The current reports from the CDC indicate that two problems have produced the two infections of healthcare workers in the US: improper procedure, and failure of protective gear (specifically the hospital bought cheap-assed holey gloves from China). There is always a disproportionate fear response to these things, so we have to keep calm. The lack of training is a big element, as displayed by the latest worker (bizarrely, and totally contrary to all training and recommendation) worked with an Ebola patient and the took a flight. That tends to strongly indicate the nurses either don't know, or failed to follow proper procedures. It also indicates that the latest infected person really doesn't have a lick of common sense and endangered an entire flight of people because of it.