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Beginning of diseases that spread from the Old World to the New world such as smallpox, measles, influenza, malaria, and syphilis
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Around 1492-1493 syphilis showed up in Europe which was spread by sailors who had returned from the Americas .A theory, "Pre-Columbian hypothesis", asserts that syphilis had always existed in the old world.
- http://scholar.harvard.edu/files/nunn/files/nunn_qian_jep_2010.pdf -
Columbus had brought Malaria to the Americas which had became established in the new world and created habit for a native mosquito species which were capable of spreading the disease easily.
- http://www.malaria.com/blog/american-plasmodium-vivax -
Measles was introduced to the Americas unintentionally by the Europeans. The natives had never been exposed to the disease and for this reason the disease was catastrophic for them much like small pox and malaria as well.
- http://nativeamericannetroots.net/diary/325 -
An infected soldier in Cortés's army had spread throughout Tenochtitlan and infected about half the population in the Aztec's capital city
- http://www.shmoop.com/columbian-exchange/timeline.html -
Smallpox came from European sailors who arrived in the Inca empire which killed over 200,000 people
- http://www.shmoop.com/columbian-exchange/timeline.html -
Yellow fever was spread through Europe and mostly the Americas which is assumed to be transmitted by mosquito that had spread it continuously. -
http://www.npr.org/sections/goatsandsoda/2016/08/28/491471697/yellow-fever-timeline-the-history-of-a-long-misunderstood-disease -
An old world disease that at first did not exist in the Americas. European settlers, travelers, and american native populations suffered due to the illness. The inhabitants of the new world didn't have the antibodies to fight off the illness.
- https://www.reference.com/health/did-chickenpox-originate-c31edeb626b477b0# -
The highest numbers of pertussis cases (260,000) was reported in 1934 and the highest numbers of death it cause was approximately 9000 in 1923. It is an old world to new world disease
- https://www.cdc.gov/mmwr/preview/mmwrhtml/00038200.htm