Anaerobic Blood Agar Base is recommended for cultivation of anaerobic microorgansisms, including very fastidious organisms from clinical specimens. Anaerobic Blood Agar base serves as a nutritious, nonselective medium allowing the cultivation of not only fastidious anaerobes but also of aerobic and microaerophillic microorganisms. It promotes both typical pigment formation in Bacteroides melaningenicus and displays double haemolytic reaction in Clostridium perfringens with added blood to the medium base. The inner zone of haemolysis is due to toxin and the outer zone of incomplete haemolysis to toxin (lecithinase activity).
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