We always hear about how diseases like Influenza and Small Pox nearly wiped out native populations in the Americas. Why didn't the Old World get hit as hard by diseases brought back from the New World? Were their bodies "more immune" to new diseases since they were already exposed to so many other diseases?
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Native Americans and (European) Diseases
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Yes - syphilis started in the West and did quite a bit of damage when it moved east with the returning conquistadors. Other than that, there really weren't that many diseases unique to the Western hemisphere that the Europeans could have brought back with them.