Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
12th Edition
ISBN: 9780134605203
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 53, Problem 2CT
A water sample could be negative for Enterococcus and coliforms and still be a major public health threat. Why?
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Every year, supposedly safe municipal water supplies causeoutbreaks of enteric illness.a. How in the course of water analysis and treatment might thesepathogens be missed?b. Why is there less tolerance for a fecal coliform in drinking orrecreational water than for other bacteria?
Why do we test water for coliforms if they are not considered pathogenic?
As you can see on the blood agar plates, some microbes can lyse red blood cells releasing nutrients into the surrounding area. What might the advantage be for a bacteria to be able to do this? Do you think this could have an effect on the bacteria’s virulence? Explain.
Chapter 53 Solutions
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
Ch. 53 - Prob. 1QCh. 53 - Will E. coli grow on Enterococcus agar, and will...Ch. 53 - Why can filtration be used to sterilize culture...Ch. 53 - Prob. 4QCh. 53 - Why is the membrane filter technique useful for a...Ch. 53 - Design an experiment to detect the presence and...Ch. 53 - A water sample could be negative for Enterococcus...
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- Explain why gram negative bacteria in general are more toxic than gram positive bacteria.arrow_forwardall of the above The following enteric diseases can be contracted from drinking contaminated water except: * O typhoid fever and cholera ) cholera and malaria amoebiasis and typhoid fever shigellosis and typhoid fever Blood-borne pathegens are Infectlous microorganisms.present in thearrow_forwarda.) Infection with this pathogen can result in a wide range of diseases from ear infections to meningitis. Group of answer choices Haemophilus influenzae Francisella tularensis Enterococcus faecalis Naegleria fowleri b.)As with all microbial control methods, the _______ the cells are exposed, the ______ damage accumulates. Group of answer choices longer, less shorter, more longer, more c.) Which of the following wavelengths would NOT be considered ultraviolet radiation? Group of answer choices 360 nm 200 nm 600 nm 25 nmarrow_forward
- Savlon Extra” disinfectant is known to exhibit good antimicrobial activity against Shigella dysenteriae. At 20oC a concentration of 5% v/v kills 2.0 x106 Sh. dysenteriae cells in 15 minutes. At 25oC the organisms were killed in 5 minutes. a) Calculate the temperature coefficient of Savlon Extra b). How long will it take the same concentration to kill the same number of Sh. dysenteriae cells at 30oC?arrow_forwardWhat are the implications if your drinking water is contaminated with coliforms? And give three examples of disease caused by coliform infection.arrow_forwardIs this the correct answer?. (9)arrow_forward
- Why is it important to leave your bottle at room temperature (arn not refrigerate it) while waiting days before checking for contamination?arrow_forwardA stool specimen of a patient with severe diarrhea was cultured in a series of specialized media for isolation of enteric organisms. The cultures yielded three isolates that were species of Salmonella, Shigella, and Escherichia. Explain why the Hydrogen sulfide production test would be diagnostically significant.arrow_forwardEnteric bacteria include Staphylococcus and Streptococcus spp. True or falsearrow_forward
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