I'm not a doctor or epidemiologist, but I think, as a matter of common sense, that there's a distinction between being an "airborne contagion" and being merely

I'm not a doctor or epidemiologist, but I think, as a matter of common sense, that there's a distinction between being an "airborne contagion" and being merely transmissible through saliva. We know that Ebola can be transmitted through saliva, but it does not cause any symptoms that would tend to aerosolize that saliva (coughing or sneezing). This would mean that you're not at all likely to get Ebola if you just happen to stand near an infected person, but we will still occasionally hear of people who seem to have been infected "through the air." These, one would think, would tend to be healthcare workers since they see patients at their sickest and may be performing procedures (e.g. intubation) that aerosolize saliva.