Source of cholera infection

John Snow made an inference about the source of cholera infection in part of London before the cause of cholera was even understood, by Select one: 1. Studying water sources in a laboratory 2. Mapping cases of people infected by the disease and figuring out what they had in common O 3. Observing people drink water from unsafe sources 4. Comparing cases of people infected with cholera and people not infected 2 According to the biological view of health, when a person can no longer function it means one of their systems is not operating correctly and the body cannot maintain Select one: O 1. Respiratory system O 2. Homeostasis O 3. iatrogenesis 4. Infections