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Did a population that has never had any exposure to Ebola magically get an immunity to it. No no it didn't The same way Native Americans didn't get a magical immunity to Old World diseases when they were first exposed. Million died from those diseases.

Yes but many of those diseases were in remote jungles. Now you have some of those diseases entering non jungle settings in people from this time period. Congrats Great Great Grandma gets to die from the mild version of Ebola.

You can literally have Flu and Cold Virus in your body at the same time. Not to mention the Flus we have now that don't affect us much is due to herd immunity. Immunity that took decades to come about. Now send said people back to a time before such immunity developed. Do you see the problem...

Um we are sending sick people from the Future to the past. Most sick people have more than just the illness they are afflicted with in their system. Many of us who got vaccinated as children against diseases we have gotten under control. Still carry a small amount of said germs on us. Said germs...