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BOC Skin, Genital, Urine Practice Exam And 100% Accurate Answers.
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A 56 year old male has 2 set of blood cultures that grow gram positive cocci after being admitted to the hospital with an oozing leg would post operation. The infected are is red, swollen, and warm to the touch. A red line has appeared at the sight of the wound and is beginning to travel up the pat...

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  • September 4, 2024
  • 13
  • 2024/2025
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BOC Skin, Genital, Urine Practice Exam
And 100% Accurate Answers.
A 56 year old male has 2 set of blood cultures that grow gram positive cocci after being admitted to the
hospital with an oozing leg would post operation. The infected are is red, swollen, and warm to the
touch. A red line has appeared at the sight of the wound and is beginning to travel up the patient's leg.
Biochemicals performed from the beta hemolytic colonies on the sheep blood agar plate revealed the
following:

CAMP test negative

hippurate hydrolysis negative

PYR positive

bacitracin sensitive

65% NACl no growth

bile esculin negative

The most likely identification is:

A. Streptococcus pyogenes

B. Streptococcus agalactiae

C. Staphylococcus aureus

D. Enterococcus faecalis - Answer A (bacitracin sensitive)



A young boy who routinely bites is finger nails develops a wound on his right pointer finger. A culture
reveals alpha hemolytic, dry colonies on the blood and CNA plates that are catalase negative, resistant to
optochin, and 6.5% NaCl negative. Gram stain of the colony is gram-positive cocci in chains. The
organism most likely isolated is:

A. Enterococcus faecium

B. Enterococcus faecalis

C. Streptococcus viridans

D. Streptococcus agalactiae - Answer C (resistant to optochin)

, An organism isolated from the surface of a skin burn is found to produce a diffusible green pigment on a
blood agar plate. Further studies of the organism would most likely show the organism to be:

A. Staphylococcus aureus

B. Serratia marcescens

C. Flavobacterium meningosepticum

D. Pseudomonas aeruginosa - Answer D



Nonfermentin gram-negative bacilli are isolated from a wound. The nitrate and oxidase are strongly
positive. The growth on Mueller-Hinton agar produces pyoverdin. The organism is:

A. Burkholderia cepacia

B. Moraxella lacunata

C. Chryseobacterium (Flavobacterium) meningosepticum

D. Pseudomonas aeruginosa - Answer D



Gram-negative bacilli with bipolar staining were isolated from a wound infection caused by a bite from a
pet cat. The following characteristic reactions were seen:

oxidase positive

glucose OF fermentative

motility negative

MacConkey no growth

Which of the following is the most likely organism?

A. Pseudomonas aeruginosa

B. Pasteurella multocida

C. Aeromonas hydrophila

D. Vibrio cholerae - Answer B (from dogs/cats)



While swimming in a lake near his home, a young boy cut his foot, and an infection developed. The
culture grew a non fastidious gram-negative, oxidase positive, beta-hemolytic, motile bacilli that
produced deoxyribonuclease (DNase). The most likely identification is:

A. Enterobacter cloacae

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