The official story now seems to be that if you, for instance, are a man with Ebola and you cut yourself shaving or in some other way and leave a tiny drop of blood on a surface the virus can survive for several days at room temperature in that blood drop. NOT an encouraging thing to read. If someone sneezes or coughs there may be tiny blood droplets in that.
Actually, as in all “fluid transmission”, people spit all the time just talking, never mind the times one lathers up too much and an obvious spitball flies out. (This is why the “fluid only” is so disingenuous.) One does not need to sneeze.
Salvia droplet on bannister - bang.