Page 207 - Review of Medical Microbiology and Immunology ( PDFDrive )
P. 207
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PART II Clinical Bacteriology
196
specimen showed filaments of gram-positive rods. The rods were
also weakly acid-fast. Regarding the causative organism, which
one of the following is most accurate?
1. (B)
(A) Culture of the organism should be done under anaerobic
2. (D)
conditions.
(B) The natural habitat of the organism is the soil.
(C) It produces an exotoxin that inhibits protein synthesis by
ADP-ribosylation.
Brief summaries of the organisms described in this chapter
(D) Sulfur granules are often seen in the skin lesion.
begin on page 665. Please consult these summaries for a rapid
(E) The vaccine against this organism contains the capsular poly- SUMMARIES OF ORGANISMS
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review of the essential material.
saccharide as the immunogen.
2. Your patient is a 20-year-old man who was in a fist fight in a bar
about 3 weeks ago. He took a punch that broke his left second
molar. He now has a 3-cm inflamed area on the skin overlying the
COURSE EXAMINATIONS
broken tooth that is draining pus. A Gram stain of the pus reveals
gram-positive filamentous rods. The rods did not appear red in
Questions on the topics discussed in this chapter can be found
the acid-fast stain. Regarding the causative organism, which one
in the Clinical Bacteriology section of Part XIII: USMLE
of the following is most accurate?
(National Board) Practice Questions starting on page 713. Also
(A) Infections caused by this organism occur primarily in the Ohio
see Part XIV: USMLE (National Board) Practice Examination
and Mississippi River Valley area.
(B) The natural habitat of the organism is the soil.
(C) This organism is resistant to both penicillins and
aminoglycosides.
(D) Sulfur granules are often seen in the pus located at the orifice starting on page 751.
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of the sinus tract in the skin lesion.
(E) The vaccine against this organism contains a toxoid as the
immunogen.
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