Running at full speed since the summer, a lab with the Centers for Disease Control and Prevention, testing blood samples collected by American hospitals on patients they suspected of having Ebola, has returned a negative result in every case. Until Tuesday.
Thomas Eric Duncan traveled from Liberia to Texas, before testing positive for Ebola. The first Ebola case diagnosed in the U.S. has raised many questions and concerns, which CNN has been responding to on social media using the hashtag #EbolaQandA. We'll continue to answer them online and on TV, but here are some of your most frequently asked questions:
Today, the Ebola virus spreads only through direct contact with bodily fluids, such as blood and vomit. But some of the nation's top infectious disease experts worry that this deadly virus could mutate and be transmitted just by a cough or a sneeze.