With this condition, the middle ear becomes infected and inflamed. The middle ear is located behind the eardrum.

The Middle Ear
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Bacteria and viruses (most common) cause this condition. Common bacteria include:

  • Streptococcus pneumoniae (most common)
  • Haemophilus influenzae
  • Moraxella (Branhamella) catarrhalis
  • Streptococcus pyogenes (less common)