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