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The fecal coliform assay is intended to be an indicator of fecal contamination; more specifically of E. coli which is an indicator microorganism for other pathogens that may be present in feces. Presence of fecal coliforms in water may not be directly harmful, and do not necessarily indicate the presence of feces. [1]
An easy way to differentiate between different types of coliform bacteria is by using an eosin methylene blue agar plate. [12] This plate is partially inhibitory to Gram (+) bacteria, and will produce a color change in the Gram (-) bacterial colonies based on lactose fermentation abilities. [ 12 ]
Fecal coliforms are more useful as indicators in recreational waters than total coliforms which include species that are naturally found in plants and soil; however, there are even some species of fecal coliforms that do not have a fecal origin, such as Klebsiella pneumoniae. Perhaps the biggest drawback to using coliforms as indicators is that ...
If you're drinking a fountain beverage from a restaurant right now, you probably want to skip to the next blog entry. You've been warned. A team of microbiologists from Hollins University in ...
The presence of some coliforms indicate fecal contamination. The term "IMViC" is an acronym for each of these tests. "I" is for indole test; "M" is for methyl red test; "V" is for Voges-Proskauer test, and "C" is for citrate test. The lower case "i" is merely for "in" as the Citrate test requires coliform samples to be placed "in Citrate".
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By testing for coliforms, especially the well known Escherichia coli (E. coli), which is a thermotolerant coliform, one can determine if the water has possibly been exposed to fecal contamination; that is, whether it has come in contact with human or animal feces. It is important to know this because many disease-causing organisms are ...
Fecal coliform, at concentrations of 2,875 units/100 milliliters, was found in a pipe that drains into Laurel Creek, which winds through the city’s 26-acre Hunt Woods Park, where dogs bathe in ...