There is an interesting article about where
Ebola came in Life Science:
"Where Did Ebola Come From? - Live Science"/Health
Scientists in this article think the Ebola
virus lives in bats, but the bats don't get sick.
They think maybe people first got Ebola virus
when someone caught and killed some bats, maybe to
make bat soup, which is a popular food.
Ebola virus attacks people's immune cells
and damages their blood vessels. Our immune
systems only work part of the time. One thing
that helps the immune system is if our bodies have
gotten a little bit of something that causes a
disease. Then our bodies can make antibodies
against whatever causes the disease, and the
antibodies can fight the disease if it comes back,
The only outbreak of Ebola this year was in the
Congo in Africa, and it ended on July 2, 2017. 6
or 8 people got the infection, and 4 died.