Product number: 7336

Beta-SSA Agar is used with blood for the selective isolation of group A streptococci. Group A streptococcal infections are the most common cause of bacterial pharyngitis in children 5 to 10 years old. Beta-SSA Agar is a highly selective agar developed for the isolation of group A beta-hemolytic streptococci. The selective agents in the medium inhibit Gram-negative bacteria and most Gram-positive bacteria, although some strains of group B beta-hemolytic streptococci may grow. Beta-SSA Agar is supplemented with 5% sheep blood to detect hemolytic patterns of streptococci.


Formula Liter
Enzymatic Digest of Casein 15 g
Enzymatic Digest of Soybean Meal 2.5 g
Sodium Chloride 5 g
Enriched Peptone 2.5 g
Selective Agents 0.3002 g
Agar 15 g

Final pH: 7.3 ± 0.2 at 25°C
Formula may be adjusted and/or supplemented as required to meet performance specifications.


  1. Suspend 40 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. Prepare 5% blood agar by aseptically adding the appropriate volume of sterile defibrinated blood to melted sterile agar medium, cooled to 45 – 50°C.

Order Details

Product # Product Description
7336A Beta-SSA Agar, 500 g
7336B Beta-SSA Agar, 2 kg
7336C Beta-SSA Agar, 10 kg

Reference Material

7336 - Beta-SSA Agar, Product Information Sheet [English]

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