Body Fluids from Normally Sterile Sites (Microbiology) Flashcards
A 25 year old man who had recently worked as a steward on a transoceanic grain ship presented to the emergency room with high fever, diarrhea and prostration. Axillary lymph nodes were hemorrhagic and enlarged. A Wright-Giemsa stain of the aspirate showed bacili that were bipolar, resembling safety pins. The most likely identification of this organism is:
A) Brucella melitensis
B) Streptobacillus moniliformis
C) Spirillum minus
D) Yersina pestis
D) Yersina pestis
Anaerobic gram-positive bacilli with subterminal spores were isolated froom a peritoneal abscess. The colony has a swarming appearance. The most likely identification of this organism is:
A) Bacillus cereus
B) Clostridium septicum
C) Eubacterium lentum
D) Bifidobacterium dentium
B) Clostridium septicum
A Gram stain of a peritoneal fluid showed large gram-positive bacilli. There was 3+ growth on anaerobic media only, with colonies producing a double zone of hemolysis. To assist with the classic identification of the organism, the microbiologist could:
A) determine if the organism ferments glucose
B) perform the oxidase test
C) set up egg yolk agar plate
D) test for bile tolerance
C) set up egg yolk agar plate
An organism from a peritoneal abscess is isolated on kanamycin-vancomycin laked blood agar and grows black colonies on BBE agar. It is nonpigmented, catalase positive, and indole negative. The genus of this organism is:
A) Acidominococcus
B) Bacteroides
C) Porphyromonas
D) Prevotella
B) Bacteroides
Thin, gram-negative bacii with tapered ends isolated from an empyema specimen grew only on anaerobic sheep blood agar. They were found to be indole positive, lipase negative and was inhibited by 20% bile. The most probable identification of this isolate would be:
A) Bacteroides distasonis
B) Prevotella melaninoenica
C) Fusobacterium nucleatum
D) Clostridium septicum
C) Fusobacterium nucleatum
