Acute mastoiditis: typical pathogens
- Streptococcus pneumoniae
- Haemophilus influenzae
- Moraxella catarrhalis
- Staphylococcus aureus
- Streptococcus pyogenes (GAS)
- Pseudomonas aeruginosa
Chronic mastoiditis: usually associated with recurrent otitis media or chronic otitis media (and prior antibiotic use), some likely pathogens encountered.
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