Transmission of Ebola
The Ebola-Reston subtype of the virus appeared in a primate research facility in Virginia, where it appears that transmission from monkey to monkey occurred through the air. Ebola-Reston has not been shown to cause illness in humans.
(Click Causes of Ebola for more information on the subtypes.)
Although all Ebola virus species have displayed the ability to be transmitted through airborne particles (aerosols) under research conditions, this type of spread has not been documented among humans in a real-world setting, such as a hospital or household.
When someone becomes infected, he or she will not feel sick immediately. For 2 to 21 days, the person feels normal; however, inside his or her body, the virus is multiplying. The period between infection with the virus and the beginning of Ebola symptoms is called the incubation period.