Early symptoms of Ebola include headache, muscle aches and fever, explains Mayo Clinic. In later stages of the disease, symptoms may include red eyes, bloody stool, vomiting, and internal and external hemorrhaging. Approximately half of Ebola virus infections end in death, according to the World Health Organization.
A person may show signs of Ebola infection in as few as two days or as many as 21 days after becoming infected, according to the Centers for Disease Control and Prevention. Symptoms typically appear five to 10 days after infection, says Mayo Clinic.
Infected humans can only spread the virus to others once they begin demonstrating symptoms, says WHO. If a human survives an Ebola infection, his body begins producing antibodies that provide resistance to Ebola for at least 10 years, according to the CDC.