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This disease was brought back to Europe and was spread through sexual contact. Since sailors went a long period of time without women during the voyage, this was the end result. New World to Old World.
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Measles were brought to the Americas from European travelers and were spread very quickly by touch. Old World to New World. Link
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This disease came from European sailors who traveled to the Americas. Smallpox strikes the Inca empire, killing more than 200,000 people. Old World to New World Link
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This disease was spread rapidly as an effect of the Columbian Exchange. Many Europeans spread this disease by coughing or by touch. Old World to New World. Link
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Europeans had many diseases foreign to the Natives in the Americas, making these diseases spread very rapidly. Old World to New World.
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This disease was spread by Natives and bought back to the Old World from sailors and explorers who were sailing back to locations, such as Europe and Afro-Eurasia. New World to Old World. Link
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As travelers came back to the Old World, known as Afro-Eurasia and Europe, this disease was spread killing people before vaccines were found. New World to Old World. Link
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Although not an actual disease, it may have well been treated as one. This was not at all healthy for people, one statistic showing that more people in World War 2 were killed by cigarettes than the actual war. New World to Old World
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