Ebola virus disease, or just Ebola is a disease of humans and other primates caused by ebolaviruses. Signs and symptoms usually start between two days and three weeks after contracting the virus as fever, sore throat, muscle aches and headaches. Then, vomiting, diarrhea and rash usually follows, with decreased liver and kidney function. Now some people begin to bleed internally and externally. The disease has a high risk of death, killing between 25 percent and 90 percent of people infected with the virus, an average of 50 percent. This is often due to the loss of liquid low blood pressure, and, typically, is six to sixteen days after the onset of symptoms.