Microbiology graduate here. Some facts about Ebola from the Public Health Agency of Canada:
Infectious dose: 1-10 viral particles.
Survival Outside Host: Filoviruses have been reported capable to survive for weeks in blood and can also survive on contaminated surfaces, particularly at low temperatures (4°C).
One study could not recover any Ebolavirus from experimentally contaminated surfaces (plastic, metal or glass) at room temperature.
In another study, Ebolavirus dried onto glass, polymeric silicone rubber, or painted aluminum alloy is able to survive in the dark for several hours under ambient conditions (between 20 and 250C and 30–40% relative humidity) (amount of virus reduced to 37% after 15.4 hours), but is less stable than some other viral hemorrhagic fevers (Lassa).
When dried in tissue culture media onto glass and stored at 4 °C, Zaire ebolavirus survived for over 50 days.
A study on transmission of ebolavirus from fomites in an isolation ward concludes that the risk of transmission is low when recommended infection control guidelines for viral hemorrhagic fevers are followed. Infection control protocols included decontamination of floors with 0.5% bleach daily and decontamination of visibly contaminated surfaces with 0.05% bleach as necessary.
Last word: For those who keeps insisting that Ebola isn't highly contagious, including the spokesman for the CDC, there's a reason why we keep it in a
BSL-4 lab, there's a reason why healthcare workers show up in a positive pressure suit.
1 to 10 viral particles that lands on your mucous membrane, be it eye, nasal passage, mouth, etc. is all it takes for the virus to multiply out of control and evade the immune system.
My professor once said: "You know you're screwed when the people treating you are in biohazard suits."