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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Chapter 48, Problem 2Q
Differentiate among a coliform, an enteric that is not a coliform, and an Enterococcus. Give an example of an organism in each group.
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Which of the following are characteristics of all coliforms? Select all that apply.
-Aerotolerant anaerobes
-Facultative anaerobes
-Ferment mannitol and produce gas and acid
-Ferment lactose and produce gas and acid
-Found in the intestines of "warm-blooded" animals
Characterize and give a brief description of the following bacteria:
Salmonella enteritis
Yersina Pestis
Prepare a concept map on the large and diverse family of Enterobacteriaceae. The following are some of the concepts you may connect with a proposition:
— general and unique characteristics;
— clinical manifestations;
— mode of transmission;
— virulence factors;
— biochemical test results (e.g. oxidase positive)
Chapter 48 Solutions
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
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- While it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by coliforms under abnormal conditions (when they are present where they are not supposed to be or when their numbers exceed acceptable levels)arrow_forwardWhile it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by pathogenic strains.arrow_forwardWhat are the implications if your drinking water is contaminated with coliforms? And give three examples of disease caused by coliform infection.arrow_forward
- What Enterobacteriaceae are of medical significance?List and describe the infections caused by these organisms.arrow_forwardEvery 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?arrow_forwardWhich coliform bacteria are the most difficult to distinguish from the Salmonella or Shigella pathogens? What is the primary characteristic used to differentiate them?arrow_forward
- Which of the following bacterial species is considered normal flora of the mouth? O 1) Streptococcus mutans 2) Escherichia coli 3) Klebsiella pneumoniae 4) Staphylococcus epidermidisarrow_forwardConsider a gram-negative pathogen isolated from marine mammals. This pathogen is subjected to a series of tests and found to have the following characteristics: oxidase-positive, does not hydrolyze urea, produces indole, does not produce acetoin. Which of the following could it be? O Pasteurella mulocida O Klebsiella pneumoniae O Yersinia enterocolitical O Mannheimia haemolyticaarrow_forwardWhat virulence factors of each species of Enterobacteriaceae?arrow_forward
- If there is a causal relationship between the presence of H. pylori and ulcers, how might you explain that 50% of the patients with a normal endoscopic examination were infected with the bacteria?arrow_forwardWhat are the common pathogens isolated from stool samples? What is the difference between a coliform bacterium and a noncoliform enteric bacterium? What diagnostic test differentiates Proteus and Providencia species from other Enterobacteriaceae? How would you differentiate between serotypes of E. coli? Are the gram-negative enteric bacilli fastidious organisms? Would they survive well outside of the body? If so, what significance would this have in their transmission? Why is serotyping particularly important in Salmonella infections and typhoid fever?arrow_forwardBelow are listed the LD-50 values for toxins from specific isolates of a bacterial species. Which toxin would be considered the "most lethal"?Diptheria toxin . .1 mg/kgClostridium difficile enterotoxin A .5 mg/kgV. cholerae toxin 250 mg/kgB. pertussis toxin 15 mg/kg a)diptheria toxin b)enterotoxin A c)V. cholerae toxin d)B. pertussis toxinarrow_forward
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