Being in a secretion is the virus’s way of trying to infect a new host.
It wouldn’t be in *tears* otherwise.
Or sweat.
Particularly sweat.
http://www.bbc.com/news/uk-29248080?
“British Ebola nurse travels to US to try to save victim”
“...His original passport was burned along with other belongings as a precaution to stop the virus from spreading...”
I guess his passport was in danger of throwing up directly on someone perhaps?