Question 1

Transmission of Plesiomonas shigelloides to humans is by

Accepted Answer

None of these organisms are considered part of the normal human flora, so no carriers are known to exist. Transmission to humans is by ingestion of contaminated water or seafood or by exposure of disrupted skin and mucosal surfaces to contaminated water.

Question 2

Transmission of Vibrio spp.to humans is by

Accepted Answer

None of these organisms are considered part of the normal human flora, so no carriers are known to exist. Transmission to humans is by ingestion of contaminated water or seafood or by exposure of disrupted skin and mucosal surfaces to contaminated water.

Question 3

The primary habitat for Plesiomonas shigelloides and Chromobacterium violaceum is

Accepted Answer

The epidemiology of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and fresh water for Aeromonas spp., P. shigelloides, and C. violaceum. None of these organisms are considered part of the normal human flora.

Question 4

Plesiomonas spp.can be described as

Accepted Answer

The organisms discussed in this chapter are considered together because they are all oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.

Question 5

Profuse watery diarrhea ("rice water stools"), leading to dramatic fluid loss, severe dehydration, and hypotension that frequently leads to death, is the hallmark of which toxin activity?

Accepted Answer

As a notorious pathogen, V. cholerae elaborates several toxins and factors that play important roles in the organism's virulence. Cholera toxin (CT) is primarily responsible for the key features of cholera. Release of this toxin causes mucosal cells to hypersecrete water and electrolytes into the lumen of the gastrointestinal tract. The result is profuse watery diarrhea, leading to dramatic fluid loss. The fluid loss results in severe dehydration and hypotension that, without medical intervention, frequently leads to death.

Question 6

The primary habitat for Aeromonas spp.is

Accepted Answer

The epidemiology of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and fresh water for Aeromonas spp., P. shigelloides, and C. violaceum. None of these organisms are considered part of the normal human flora.

Question 7

Stool specimens suspected of containing which enteric pathogen should be collected and transported only in Cary-Blair medium because buffered glycerol saline is toxic for this bacterium?

Accepted Answer

Fecal specimens sent for detection of Vibrio spp. should be collected and transported only in Cary-Blair medium. Buffered glycerol saline is not acceptable, because glycerol is toxic for vibrios. Feces are preferable, but rectal swabs are acceptable during the acute phase of diarrheal illness.

Question 8

Transmission of and Chromobacterium violaceum to humans is by

Accepted Answer

None of these organisms are considered part of the normal human flora, so no carriers are known to exist. Transmission to humans is by ingestion of contaminated water or seafood or by exposure of disrupted skin and mucosal surfaces to contaminated water.

Question 9

Aeromonas, Vibrio, and Plesiomonas are all

Accepted Answer

The organisms discussed in this chapter are considered together because they are all oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.

Question 10

The selective medium thiosulfate citrate bile salts sucrose (TCBS) agar is especially formulated for isolating what pathogen from stool cultures?

Accepted Answer

Fecal samples for cultivation of Vibrio spp. are plated on the selective medium thiosulfate citrate bile salts sucrose (TCBS) agar. Although some Vibrio spp. grow very poorly on this medium, those that grow well produce either yellow or green colonies, depending on whether they are able to ferment sucrose (and produce yellow colonies).

Question 11

The primary habitat for Chromobacterium violaceum is

Accepted Answer

The epidemiology of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and fresh water for Aeromonas spp., P. shigelloides, and C. violaceum. None of these organisms are considered part of the normal human flora.

Question 12

The primary habitat for Vibrio spp is

Accepted Answer

The epidemiology of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and fresh water for Aeromonas spp., P. shigelloides, and C. violaceum. None of these organisms are considered part of the normal human flora.

Question 13

Aeromonas spp.can be described as

Accepted Answer

The organisms discussed in this chapter are considered together because they are all oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.

Question 14

Transmission of Aeromonas spp.to humans is by

Accepted Answer

None of these organisms are considered part of the normal human flora, so no carriers are known to exist. Transmission to humans is by ingestion of contaminated water or seafood or by exposure of disrupted skin and mucosal surfaces to contaminated water.

Question 15

Which statement best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?

Accepted Answer

The epidemiology of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum are similar in many aspects. The primary habitat for most of these organisms is water, generally brackish or marine water for Vibrio spp. and fresh water for Aeromonas spp., P. shigelloides, and C. violaceum.

Question 16

Vibrio spp.can be described as

Accepted Answer

The organisms discussed in this chapter are considered together because they are all oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.

Question 17

Profuse watery diarrhea ("rice water stools"), leading to dramatic fluid loss, severe dehydration, and hypotension that frequently leads to death, is the hallmark of infection with which bacterial species?

Accepted Answer

As a notorious pathogen, Vibrio cholerae elaborates several toxins and factors that play important roles in the organism's virulence. Cholera toxin (CT) is primarily responsible for the key features of cholera. Release of this toxin causes mucosal cells to hypersecrete water and electrolytes into the lumen of the gastrointestinal tract. The result is profuse watery diarrhea, leading to dramatic fluid loss. The fluid loss results in severe dehydration and hypotension that, without medical intervention, frequently leads to death.

Quiz 25: Vibrio, Aeromonas, Plesiomonas Shigelloides, and Chromobacterium Violaceum

Transmission of Plesiomonas shigelloides to humans is by

Transmission of Vibrio spp.to humans is by

The primary habitat for Plesiomonas shigelloides and Chromobacterium violaceum is

Plesiomonas spp.can be described as

Profuse watery diarrhea ("rice water stools") , leading to dramatic fluid loss, severe dehydration, and hypotension that frequently leads to death, is the hallmark of which toxin activity?

The primary habitat for Aeromonas spp.is

Stool specimens suspected of containing which enteric pathogen should be collected and transported only in Cary-Blair medium because buffered glycerol saline is toxic for this bacterium?

Transmission of and Chromobacterium violaceum to humans is by

Aeromonas, Vibrio, and Plesiomonas are all

The selective medium thiosulfate citrate bile salts sucrose (TCBS) agar is especially formulated for isolating what pathogen from stool cultures?

The primary habitat for Chromobacterium violaceum is

The primary habitat for Vibrio spp is

Aeromonas spp.can be described as

Transmission of Aeromonas spp.to humans is by

Which statement best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?

Vibrio spp.can be described as

Profuse watery diarrhea ("rice water stools") , leading to dramatic fluid loss, severe dehydration, and hypotension that frequently leads to death, is the hallmark of infection with which bacterial species?