BIOL 3P43 Study Guide - Midterm Guide: Fecal Coliform, Cyclospora Cayetanensis, Cryptosporidium Parvum
25 Feb 2019
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20th century, cities in the ohio river watershed commonly had death rates due to typhoid (salmonella typhi) In 1854, a cholera outbreak in london, england was shown to be linked to a pump that derived its water from a polluted section of the river. John snow: father of epidemiology: water as a carrier of disease-producing organisms -> mid-1880"s with the establishment of the germ theory by pasteur. It may be generalized that cellular viruses last longer than bacteria while protozoa can extend their survival time by encystation. Legionella pneumophila infectious hepatitis a, poliovirus and viral gastroenteritis are of practical concern as water-borne viruses. enteric viruses survive less than three months in the environment but have been reported surviving up to five months in sewage. There is dispute over whether a minimum infectious dose is necessary as for bacteria, some claim a single virus is sufficient for infection.
