Exam 24: Vibrio, aeromonas, Plesiomonas Shigelloides, and Chromobacterium Violaceum

An organism suspected of being one of the Vibrio spp.grew on MacConkey agar.To determine whether it was a vibrio cell or in the Enterobacteriaceae family,an oxidase test was performed on the colony.The results of the oxidase test,however,were negative.Which one of the following statements explains this discrepancy?

Transmission of P.shigelloides to humans is by:

The transmission of Vibrio spp.to humans is by:

V.cholerae and Vibrio alginolyticus appear what color on TCBS agar?

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

The primary habitat for Vibrio spp.is:

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

To determine the validity of 0% sodium chloride (NaCl)broth,which two organisms should be used for quality control purposes?

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

Transmission of Aeromonas spp.to humans is by:

Transmission of C.violaceum to humans is by:

Colonies growing on modified cefsulodin-irgasan-novobiocin (CIN)agar appear to be either Aeromonas spp.or Yersinia enterocolitica.Which test should be performed to differentiate between these two organisms?

The drug of choice to treat patients with V.cholerae is:

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

A vibriostatic test using 0/129 (2,4-diamino-6,7-diisopropylpteridine)-impregnated disks differentiates vibrio cells,which are susceptible,and _________,which are resistant.

Which organism,which is oxidase positive,does not grow on TCBS agar,has the ability to decarboxylate lysine and ornithine but cannot utilize arginine,and would have the following colonial characteristics on sheep blood agar and MacConkey agar?

The reagent used in the "string test" is:

Which of the following species of Aeromonas is oxidase-positive,sucrose-positive,and can decarboxylate ornithine?

V.cholerae and Photobacterium damsela are used to perform quality control on TCBS agar.After overnight incubation,no growth is observed.What is the next course of action?

Which organism appears green on TCBS agar and is halophilic?