What you need to know
The risk of Ebola transmission is low. Becoming infected requires direct, physical contact with the bodily fluids (vomit, faeces, urine, blood, semen, etc.) of people who have been infected with or died from Ebola virus disease (EVD).
http://www.who.int/csr/disease/ebola/protective-measures-staff/en/
and airborne spread among humans is strongly suspected, although it has not yet been conclusively demonstrated
Interesting in light of Writebol's infection ... no mask ... but gown/gloves ...