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Microbiology

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Gram Negative Bacilli

Question
61 out of 81
 

A severely burned fire fighter develops a rapidly disseminating bacterial infection while hospitalizeD. "Green pus" is noted in the burned tissue and cultures of both the tissue and blood yield small oxidase-positive gram-negative rods. Which of the following statements most accurately conveys information about this organism? (AIPG 2012)
 
A

Endotoxin is the only virulence factor known to be produced by these bacteri

B Humans are the only known reservoir hosts for these bacteriA.
C The bacteria are difficult to culture because they have numerous growth requirements.
D These are among the most antibiotic resistant of all clinically relevant bacteriA.
Ans. D These are among the most antibiotic resistant of all clinically relevant bacteria

a. The most important cause of infections of burn wounds is Pseudomonas which is an oxidase and Catalase positive gram negative rod shaped bacterium.

b. Pseudomonas aeruginosa is an obligate aerobe that grows on many types of culture media, sometimes producing a sweet or grape-like odor.

c. It often produces a nonfluorescent bluish pigment (pyocyanin) which diffuses into agar or pus fluids. Many strains also produce a fluorescent pigment (pyoverdin), which gives a greenish color.

d. One of the most significant problems with Pseudomonas infections is the high level of natural resistance to many antimicrobials that this widespread environmental opportunist exhibits.

 

 

Gram Negative Bacilli Flashcard List

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