Ebola virus capsid, computer model. Illustration showing the internal and external structure of the ebola virus with glycoprotein spikes on viral envelope, matrix space, nucleocapsid and single RNA strand. Ebola causes a severe, and often fatal disease in humans and nonhuman primates (monkeys, gorillas and chimpanzees). Symptoms include fever, fatigue, headache, muscle aches, vomiting, diarrhoea and haemorrhaging (internal bleeding). There is no cure for the disease, but three quarters of patients can recover if provided with sufficient medical support.