Which medium inhibits bacteria and saprophytic fungi using cycloheximide, chloramphenicol, and dextrose and is used for dermatophytes?

Which medium inhibits bacteria and saprophytic fungi using cycloheximide, chloramphenicol, and dextrose and is used for dermatophytes?

• A. Mycosel Agar
• B. Dermatophyte Test Medium
• C. SABHI Agar
• D. BHI Agar

Answer: (A)

Isolating dermatophytes from clinical specimens often requires a medium that suppresses competing bacteria and saprophytic fungi. Cycloheximide inhibits saprophytic fungi, while chloramphenicol inhibits bacteria; dextrose provides a readily usable carbon source for fungal growth. This combination creates a selective environment that favors dermatophytes and reduces contamination. This is exactly what Mycosel Agar provides, making it the preferred medium for isolating dermatophytes. Other media either rely on a color change for presumptive detection or are general-purpose and don’t include both inhibitors, so they don’t offer the same level of selective isolation.

Isolating dermatophytes from clinical specimens often requires a medium that suppresses competing bacteria and saprophytic fungi. Cycloheximide inhibits saprophytic fungi, while chloramphenicol inhibits bacteria; dextrose provides a readily usable carbon source for fungal growth. This combination creates a selective environment that favors dermatophytes and reduces contamination. This is exactly what Mycosel Agar provides, making it the preferred medium for isolating dermatophytes. Other media either rely on a color change for presumptive detection or are general-purpose and don’t include both inhibitors, so they don’t offer the same level of selective isolation.