Q.1
Purple agar with 1 % maltose is used to differentiate among following coagulase-positive staphylococci
(A) . Staphylococcus aureus
(B) . Staphylococcus intermedius
(C) . Staphylococcus epidermidis
(D) . Staphylococcus hyicus
Choose the correct answer from the options given below:
- Maltose Purple Agar in Staphylococcal Speciation:
- Purple agar containing $1\%$ maltose (bromocresol purple indicator) is the classical differential medium used in veterinary microbiology to distinguish among veterinary coagulase-positive and coagulase-variable staphylococci:
- Staphylococcus aureus: Strongly ferments maltose with acid production, turning the purple medium yellow.
- Staphylococcus intermedius (and S. pseudintermedius): Fails to ferment maltose anaerobically/aerobically (remains purple).
- Staphylococcus hyicus: Coagulase-variable/positive causative agent of porcine exudative epidermitis (greasy pig disease), also displays distinct fermentation dynamics.
- Exclusion: Staphylococcus epidermidis is an opportunistic coagulase-negative staphylococcus (CoNS).
Correct option: (1) (A), (6) and (D) only.
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