From Wikipedia: "Ebola virus disease or simply Ebola is a disease of humans and other primates caused by ebolaviruses. Signs and symptoms typically start between two days and three weeks after contracting the virus as a fever, sore throat, muscle pain, and headaches. Then, vomiting, diarrhea and rash usually follow, along with decreased function of the liver and kidneys. At this time some people begin to bleed both internally and externally. The disease has a high risk of death, killing between 25 % and 90 % of those infected with the virus, averaging out at 50 percent. This is often due to low blood pressure from fluid loss, and typically follows six to sixteen days after symptoms appear. The virus spreads by direct contact with blood or other body fluids of an infected human or other animal. Infection with the virus may also occur by direct contact with a recently contaminated item or surface." (See first link for more on Ebola & for references).
Scientific American web-site (see second link) for in-depth reports on Ebola.
A recent article in Scientific American (see third link) - titled "Infection Secrets of Ebola Explained" - is highly informative to know about Ebola virus.
Brief excerpts from this highly educative Science American article below: (kindly read full article from the third link)
"The Ebola virus gives itself a head start when it first slips into a human body by disabling parts of the immune system that should be leading the charge against the invader. It hijacks the functions of certain defense warriors known as dendritic cells—whose primary function is to alert the immune system to the incoming threat. Other targets include monocytes and macrophages, types of white blood cells whose job is to absorb and clear away foreign organisms."
"These are the first cells Ebola infects and bends to the process of making more Ebola viruses. The maneuver is the viral version of invading a country by hypnotizing the army and turning it against its own people. Then, having kicked the immune system’s feet out from under it, Ebola takes off in a run."
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http://en.wikipedia.org/wiki/Ebola_virus_disease
http://www.scientificamerican.com/report/ebola-what-you-need-to-know/
http://www.scientificamerican.com/article/how-ebola-blindsides-the-bodys-defenses/