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Edward Jenner discovered that given people a mild disease, such as cowpox, then smallpox would never be contracted
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Malaria was an e=infection disease caused by mosqitoes. Malaria causes extremely tiredness, vomiting. fevers, etc. people can prevent this infectious disease by using insect repelents, bed covers and mosqito nets
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John Snow using geography to map out where the outbreak of cholera has occured and how many people it effected/ killed. cholera was caused by contaminated water which many people had to drink and use because of the lack of filters.
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over 20 percent of the population was infected by this pandemic. the spanish flu, as it was called, made people feel fine in the morning but ould kill them by nightfall. affected most people of ages 20-50 years old. killed over 600,000 people in the U.S alone.
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jonas salk has taken the poliovirus into his own hands. His plan to inject people with the virus was hughly effective. he injected children with the virus and the outcome of that was full recovery. he then injected healthy people including himself with the poliovirus and found that they stayed healthy.
