Hoyle Medium Base (DM120) is recommended for selective isolation and differentiation of Corynebacterium diphtheriae types.
| Ingredients | Gms / Liter |
| Peptic digest of animal tissue | 10.00 |
| Beef extract | 10.00 |
| Sodium chloride | 5.00 |
| Agar | 15.00 |
| Final pH: 7.8 ± 0.2 at 25°C | |
| Formula may be adjusted and/or supplemented as required to meet performance specifications | |
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