Small pox was created by the variola virus and existed for about 3,000 years and was the worlds most feared disease until it was eradicated by vaccine.This disease could cause death.
Cows were used for pulling wagons and for food.Cows were needed a lot in the new world.
Domesticated Animals (Horses)
Wheat was needed a lot in the new world especially to make bread.
The communist government under Mao Zedong, in response to the syphilisepidemic, issued free treatment for all those infected and increased screening for the disease. In the 1960s it was found that syphilis was almost completelyeradicated in China.
Horses were brought from the new world to the old world because they needed it for pulling wagons and for migrating.The Europeans needed them alot.