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Introduction. Bacteria are microorganisms that grow everywhere. We can collect and grow them in specially prepared petri dishes. Blood agar or tryptic soy agar with 5% sheep's blood is an excellent medium for supplying bacteria with nutrients and an environment in which we can see them grow.
The most common organisms associated with peritonsillar abscess are listed in Table 1. Streptococcus pyogenes (group A beta-hemolytic streptococcus) is the most common aerobic organism associated with peritonsillar abscess. The most common anaerobic organism is Fusobacterium.