The World Health Organization believes that Ebola is transmitted only by direct contact and indirect contact with blood and body fluids, and that healthy people can become infected through direct contact with the blood, body fluids and secretions of symptomatic Ebola-infected people through broken skin or mucous membranes. Blood, feces and vomit contain the virus and are most likely to cause transmission, and in particularly severe cases, the virus may be transmitted through saliva. However, the patient’s sweat has not been found to have the virus intact and does not usually cause transmission of the virus. After a person is infected with the Ebola virus until symptoms appear, there is a total of 8-10 days of incubation period, which is asymptomatic and is also considered healthy. Infected people in the incubation period will not spread the Ebola virus, and only patients with symptoms will spread the Ebola virus.