33 Anaerobic infections differ from aerobic infections in which of the following

Question

33 Anaerobic infections differ from aerobic infections in which of the following? A. They usually respond favorably with aminoglycoside therapy. They usually arise from exogenous sources C. They are usually polymicrobic D. Gram stained smears of the specimens are less helpful in diagnosis 34. An anaerobic gram-negative bacillus isolated from a blood culture following bowel surgery grew, smooth, white nonhemolytic colonies. A Gram stained smear showed a pale, bipolary-stained rod with rounded ends. Bile stimulated growth of the organism and catalase was produced. The isolate was not inhibited by colistin, kanamycin or vancomycin; indole was not produced. The most likely identification of this isolate is: A. Bacteroides fragilis B. Prevotella (Bacteroides) melaninogenica C. Fusobacterium nucleatum D. Fusobacterium varium 35. A thin, anaerobic gram-negative bacillus with tapered ends isolated from an empyema was found to be indole positive, lipase negative, and inhibited by 20% bile. Colonies were described as "speckled" or resembling "ground glass" and fluoresced weakly when exposed to ultraviolet light. The most probable identification of this isolate would be A. Bacteroides urelyticus B. Prevotella (Bacteroides) melaninogenica C. Fusobacterium nucleatum D. Fusobacterium mortiferum 36. Crust from a cauliflower-like lesion on the hand exhibited brown spherical bodies 6-12 u m in diameter when examined microscopically. After 3 weeks of incubation at room temperature, a slow-growing black mold grew on Sabouraud's dextrose agar. Microscopic examination revealed cladosporium, phialophora and acrotheca types of sporulation. The probable identification of this orgamism is A. Fonsecaea pedrosoi B. Pseudallescheria boydii C. Phialophora verrucosa D. Cladosporium carrioni

Explanation / Answer

33. They are usually polymicrobic and can include obligate and facultative anaerobes and microaerophilic bacteria as well.

34. Bacteroides fragilis

35. Fusobacterium nucleatum

36. Fonsecaea pedrosoi

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