Ebola Virus Infection FAQ
Ebola Outbreak Unfolds in Africa continued...
Q. How deadly is Ebola?
A. The Ebola strain in the current outbreak is the most lethal of the five known strains of the virus. It is called Ebola Zaire and usually kills up to 9 out of 10 infected people. But the high death rate might be due to a lack of modern medical care, Adalja says. “It’s hard to say exactly what the [death] rate would be in a modern hospital with all of its intensive care units.”
The CDC said in July the Ebola death rate in the West African outbreak is about 6 in 10, rather than 9 in 10. That shows that early treatment efforts have been effective, says Stephan Monroe, deputy director of the National Center for Emerging and Zoonotic Infectious Diseases at the CDC.
On July 31, the CDC issued a travel advisory recommending against non-essential travel to Guinea, Liberia, and Sierra Leone.
Q. What are the symptoms?
A. At first, the symptoms are like a bad case of the flu: high fever, muscle aches, headache, sore throat, and weakness. They are followed quickly by vomiting, diarrhea, and internal and external bleeding, which can spread the virus. The kidneys and liver begin to fail.
Ebola Zaire kills people quickly, typically 7 to 14 days after symptoms appear, Adalja says.
A person can have the virus but not show any symptoms for as long as 3 weeks, he says. People who survive can still have the virus in their system for weeks afterward.
The virus has been detected in semen up to 7 weeks after recovery, according to the WHO. But this is very rare, says Thomas Geisbert, PhD, a professor of microbiology and immunology at the University of Texas Medical Branch. Geisbert has been studying the Ebola virus since 1988.
Q. How does the virus spread?
A. Ebola isn’t as contagious as more common viruses, such as colds, influenza, or measles, Adalja says. It spreads to people by close contact with skin and bodily fluids from infected animals, such as fruit bats and monkeys. Then it spreads from person to person the same way.