Disease-causing organisms

Modern science of epidemiology is founded on Dr. John Snow’s observations of the distribution of cholera cases in an outbreak during the 19th century in London. (Source was water company providing water to affected neighborhoods.)

Some disease-causing organisms can pass through sewage- and water-treatment plants.

Modern science of epidemiology is founded on Dr. John Snow’s observations of the distribution of cholera cases in an outbreak during the 19th century in London. (Source was water company providing water to affected neighborhoods.)