Product number: 7420

MRSA Agar Base is used with added oxacillin (6 mg/L) in the preparation of MRSA Agar. MRSA Agar is used as a screening medium for the determination of methicillin resistance and oxacillin resistance in Staphylococcus aureus in a laboratory setting. MRSA Agar Base is not intended for use in the diagnosis of disease or other conditions in humans.


Formula Liter
Beef Extract 2 g
Acid Hydrolysate of Casein 17.5 g
Starch 1.5 g
Agar 17 g
Sodium Chloride 40 g

Final pH: 7.3 ± 0.1 at 25°C
Formula may be adjusted and/or supplemented as required to meet performance specifications.

Antimicrobic Additive

Oxacillin, 6 mg/10 mL


  1. Suspend 78 g of the medium in one liter of purified water.
  2. Heat with frequent agitation and boil for one minute to completely dissolve the medium.
  3. Autoclave at 121°C for 15 minutes.
  4. After cooling to 45 – 50°C aseptically add 10 mL of a filter sterilized solution of oxacillin (6 mg/10 mL purified water).

Order Details

Product # Product Description
7420A MRSA Agar Base, 500 g

Reference Material

7420 - MRSA Agar Base, Product Information Sheet [English]

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