Question:
Staphylococcus pseudintermedius can be identified on the basis of following characters
A. Coagulase negative
B. Susceptible to polymyxin B
C. V P test positive
D. \(\beta\)- galactosidase positive
Choose the correct answer from the options given below:
Staphylococcus pseudintermedius can be identified on the basis of following characters
A. Coagulase negative
B. Susceptible to polymyxin B
C. V P test positive
D. \(\beta\)- galactosidase positive
Choose the correct answer from the options given below:
A. Coagulase negative
B. Susceptible to polymyxin B
C. V P test positive
D. \(\beta\)- galactosidase positive
Choose the correct answer from the options given below:
Show Hint
Differential Diagnostic Rule: S. pseudintermedius vs S. aureus:
S. pseudintermedius = Polymyxin B Susceptible, ONPG ($eta$-galactosidase) Positive, VP Negative.
S. aureus = Polymyxin B Resistant, ONPG Negative, VP Positive.
S. pseudintermedius = Polymyxin B Susceptible, ONPG ($eta$-galactosidase) Positive, VP Negative.
S. aureus = Polymyxin B Resistant, ONPG Negative, VP Positive.
Updated On: Sep 7, 2026
- B and D only
- A and C only
- A and B only
- C and D only
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Phenotypic and biochemical differentiation of Staphylococcus intermedius group (SIG) members from Staphylococcus aureus in veterinary clinical microbiology.
Step 2: Detailed Explanation:
Diagnostic biochemical profile of Staphylococcus pseudintermedius (the major pyogenic pathogen in canine pyoderma and otitis):
1. Coagulase Test: It is Coagulase-positive (clots rabbit/canine plasma), ruling out character A.
2. Polymyxin B Susceptibility (B): It is characteristically susceptible to polymyxin B ($300\text{ units}$ disc), differentiating it from polymyxin B-resistant S. aureus.
3. Voges-Proskauer Test (C): It is VP-negative (acetoin negative), whereas S. aureus is VP-positive.
4. $\beta$-Galactosidase Activity (D): It is ONPG positive (possesses $\beta$-galactosidase), unlike S. aureus which is ONPG negative.
Therefore, characters B and D accurately identify S. pseudintermedius.
Step 3: Final Answer:
Thus, the correct answer is B and D only, corresponding to option (A).
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