Case Study 1

A 64-year old male with fever, malaise, and cough.

Correct!

Nothing of clinical significance is isolated when the bronchial lavage fluid is cultured on blood agar plates. However, the organism grows well on charcoal yeast extract agar with blood.
Despite antimicrobial and supportive therapy, the patient subsequently develops multiorgan failure and dies after a protracted course.

Question 4 of 6

Which organism caused this disease?

A. Legionella pneumophila
This organism grows well on charcoal yeast extract agar with blood.
B. Pseudomonas aeruginosa
Like Escherichia coli, Pseudomonas aeruginosa can cause this sort of infection, but both should grow on blood agar.
C. Bordetella pertussis
Bordetella pertussis is an uncommon cause of bronchopneumonia, but usually has an acute course unlike the one described in this case. Furthermore, as the patient has been vaccinated (DPT) he is probably immune to infections caused by Bordetella pertussis.
D. Escherichia coli
Escherichia coli like Pseudomonas aeruginosa can cause this sort of infection, but both should grow on blood agar.


The Biology Project
University of Arizona
Tuesday, August 4, 1998
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