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Old 09-17-2011
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Bacteria gram-negative, nonfermenting rod that produced a greenish hue in the culture plates!

A 48-year-old man had a long history of alcoholism. He remained intubated and ventilator dependent for several weeks. He developed a high fever and was treated with broad-spectrum antibiotics. Culture of his tracheal aspirate initially grew S. aureus. After more antibiotic treatment, Gram stain of his aspirate showed PMNs and gram-negative rods. A chest x-ray demonstrated an infiltrate with possible small abscesses. Tracheal aspirate then yielded a heavy growth of a gram-negative, nonfermenting rod that produced a greenish hue in the culture plates. Which of the following is the most likely organism causing this patientís
problem?

A) H. influenzae
B) L. pneumophilia
C) M. pneumoniae
D) P. aeruginosa
E) S. pneumoniae
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Old 09-17-2011
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D) P. aeruginosa
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  #3  
Old 09-17-2011
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P.aeruginosa
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Old 09-18-2011
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Correct Answer

the correct answer is p.aeuroginosa
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Old 09-18-2011
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D)

there are 3 obligate aerobes (have no fermentative pathways whatsoever)

1Pseudomonas
2Mycobacterium
3(Bacillus)
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Old 09-18-2011
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ans s d. pseudomonas...
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Old 09-18-2011
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D) P. aeruginosa is G- rodes in ventlation assisted patients
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Old 09-18-2011
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Correct Answer

yes it is p.aeurogenosa ,, many keywords in the case gram negative rods , non fermenting, green hue in culture , the patient was on broad spectrum antibiotic ( superinfection) which are all indicating p.aeurogenosa
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Old 09-18-2011
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P.Aeruginosa
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