Not being in your field, when you say "droplet transmission" are you referring to airborne micro droplets? I know of these from chemical engineering and combustion technology.
Yeah those droplets can get mighty small. Recall Millikan's famous electron oil drop experiments. Imagine now one of those tiny droplets landing in your mucus membranes...and causing 'instant death' from Ebola! Then you'll get the CDC saying that you were at fault for not wearing your respirator properly....