9. An oxidase-positive, wrinkled, non-lactose fermenting colony is suspicious for
a. the organism that causes glanders.
b. an individual with cystic fibrosis.
c. a potential bioterrorism agent.
d. a common antibiotic-resistant nosocomial organism.
10. The isolation of an extremely mucoid, oxidase-positive, non-lactose fermenter from the lower respiratory tract usually correlates with the clinical diagnosis of
a. melioidosis.
b. nothingâit is an environmental contaminant.
c. glanders.
d. cystic fibrosis.
11. Which of the following gram-negative rods is associated with individuals who have cystic fibrosis?
a. An oxidase-positive, pyocyanin-producing, non-lactose fermenter.
b. An oxidase-negative, nonmotile, non-lactose fermenter that is K/NC on TSI.
c. An oxidase-positive, lysine-positive, non-lactose fermenter.
d. a and c.
e. All of the above.
12. Two blood cultures of a premature infant grow a yellow-pigmented colony that is a non-lactose fermenter. The colony provides the following reactions:
Oxidase: purple Indole: pink Motility: negative
The organism is probably
a. Burkholderia cepacia complex.
b. Stenotrophomonas maltophilia.
c. Elizabethkingia meningosepticum.
d. none of the above.
13. An anemic patient received a unit of blood. She develops fever and chills after infusion of the unit. Blood cultures of the patient and a sample of the blood unit grow the same organism. The non-lactose fermenter isolated displays the following reactions:
Oxidase: purple Growth at 42°C: negative Colony under UV light: yellow Arginine: purple Motility: positive Gelatin hydrolysis: liquified Acetamide: no color change Nitrate after addition of zinc: red
The organism is
a. Pseudomonas. putida
b. P. fluorescens.
c. P. aeruginosa.
d. P. stutzeri.
14. Which of the following oxidase-negative, non-motile, non-fermenting, gram-negative rods can mimic a late lactose fermenter due to the oxidation of lactose rather than fermentation?
a. Acinetobacter baumannii
b. Burkholderia cepacia complex
c. Achromobacter xylosoxidans
d. Stenotrophomonas maltophilia
15. A physician calls the microbiology department for the results of a lower respiratory culture of a 15-year-old female with cystic fibrosis. The culture grows an oxidase-negative, motile, lysine-positive, non-lactose fermenter that presents as K/NC on TSI and an oxidase-positive, lysine-positive, non-lactose fermenter. Based on these results, you tell the physician she can potentially treat both organisms with
a. imipenem.
b. an aminoglycoside.
c. polymyxin B.
d. trimethoprim-sulfamethoxazole.
16. An oxidase-negative, non-motile, non-lactose fermenter demonstrates K/NC on TSI and is considered a significant nosocomial pathogen due to its multiresistance. Which of the following antibiotics remains a viable treatment option for this organism?
a. Imipenem
b. Piperacillin/tazobactam
c. Aztreonam
d. Ciprofloxacin
17. A tracheal aspirate, obtained from a comatose patient on a ventilator, grew an oxidase-positive non-lactose fermenter that produced a distinctive odor of sliced apples. It proved to be:
Motile: positive Nitrate: red after addition of reagents A, B, and zinc OF medium: open tubes: glucose: blue, maltose: blue, lactose: blue, sucrose: blue
closed tubes: glucose: green, maltose: green, lactose: green, sucrose: green
This organism is
a. Acinetobacter baumannii.
b. Alcaligenes faecalis.
c. Moraxella nonliquefaciens.
d. Elizabethkingia meningosepticum.
9. An oxidase-positive, wrinkled, non-lactose fermenting colony is suspicious for
a. the organism that causes glanders.
b. an individual with cystic fibrosis.
c. a potential bioterrorism agent.
d. a common antibiotic-resistant nosocomial organism.
10. The isolation of an extremely mucoid, oxidase-positive, non-lactose fermenter from the lower respiratory tract usually correlates with the clinical diagnosis of
a. melioidosis.
b. nothingâit is an environmental contaminant.
c. glanders.
d. cystic fibrosis.
11. Which of the following gram-negative rods is associated with individuals who have cystic fibrosis?
a. An oxidase-positive, pyocyanin-producing, non-lactose fermenter.
b. An oxidase-negative, nonmotile, non-lactose fermenter that is K/NC on TSI.
c. An oxidase-positive, lysine-positive, non-lactose fermenter.
d. a and c.
e. All of the above.
12. Two blood cultures of a premature infant grow a yellow-pigmented colony that is a non-lactose fermenter. The colony provides the following reactions:
Oxidase: purple Indole: pink Motility: negative
The organism is probably
a. Burkholderia cepacia complex.
b. Stenotrophomonas maltophilia.
c. Elizabethkingia meningosepticum.
d. none of the above.
13. An anemic patient received a unit of blood. She develops fever and chills after infusion of the unit. Blood cultures of the patient and a sample of the blood unit grow the same organism. The non-lactose fermenter isolated displays the following reactions:
Oxidase: purple Growth at 42°C: negative Colony under UV light: yellow Arginine: purple Motility: positive Gelatin hydrolysis: liquified Acetamide: no color change Nitrate after addition of zinc: red
The organism is
a. Pseudomonas. putida
b. P. fluorescens.
c. P. aeruginosa.
d. P. stutzeri.
14. Which of the following oxidase-negative, non-motile, non-fermenting, gram-negative rods can mimic a late lactose fermenter due to the oxidation of lactose rather than fermentation?
a. Acinetobacter baumannii
b. Burkholderia cepacia complex
c. Achromobacter xylosoxidans
d. Stenotrophomonas maltophilia
15. A physician calls the microbiology department for the results of a lower respiratory culture of a 15-year-old female with cystic fibrosis. The culture grows an oxidase-negative, motile, lysine-positive, non-lactose fermenter that presents as K/NC on TSI and an oxidase-positive, lysine-positive, non-lactose fermenter. Based on these results, you tell the physician she can potentially treat both organisms with
a. imipenem.
b. an aminoglycoside.
c. polymyxin B.
d. trimethoprim-sulfamethoxazole.
16. An oxidase-negative, non-motile, non-lactose fermenter demonstrates K/NC on TSI and is considered a significant nosocomial pathogen due to its multiresistance. Which of the following antibiotics remains a viable treatment option for this organism?
a. Imipenem
b. Piperacillin/tazobactam
c. Aztreonam
d. Ciprofloxacin
17. A tracheal aspirate, obtained from a comatose patient on a ventilator, grew an oxidase-positive non-lactose fermenter that produced a distinctive odor of sliced apples. It proved to be:
Motile: positive Nitrate: red after addition of reagents A, B, and zinc OF medium: open tubes: glucose: blue, maltose: blue, lactose: blue, sucrose: blue
closed tubes: glucose: green, maltose: green, lactose: green, sucrose: green
This organism is
a. Acinetobacter baumannii.
b. Alcaligenes faecalis.
c. Moraxella nonliquefaciens.
d. Elizabethkingia meningosepticum.
