Sonya610
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Since Ebola has not been in the environment here in the US, people in the US don't have any immunities at all to the virus. Whereas people in Africa probably have some level of immunity built up over the years.
Not so sure the people in Africa do have much of an immunity. Some of these diseases (HIV, SARS, Ebola) were only recently discovered when they started infecting large numbers of people (probably caught from eating bush meat). It is quite likely that the majority of the population was never exposed before.
HIV is a good example, that originated in Africa yet they believe 10% of Europeans (and European Americans) have a natural resistance because it is similar to the Black Plague (or possibly smallpox) that ravaged Europe and the Middle East. Europeans are MORE likely to be resistant than Sub-Saharan Africans even though the disease originated in Africa.
Devastating epidemics that swept Europe during the Middle Ages seem to have had an unexpected benefit - leaving 10% of today's Europeans resistant to HIV infection.
But epidemics of which disease? Researchers claimed this week that plague helped boost our immunity to HIV, but rival teams are arguing that the credit should go to smallpox.
http://www.nature.com/news/2005/050307/full/news050307-15.html