4 months old boy | 2 years ago
What causes acute otitis media?
2 years ago
Acute otitis media usually is caused by one of four bacteria: Streptococcus pneumoniae (pneumococcus) in 30% to 45% of cases. Haemophilus influenzae (Haemophilus-but not the Haemophilus strain in the HIB or meningitis vaccine) in 20% to 30% of cases. Moraxella catarrhalis (Moraxella; sometimes called Branhamella catarrhalis) in approximately 10% of cases. Group A Streptococcus (like the strep bacteria of strep throat) in 5% of the cases. The pneumococcus bacteria is now the most difficult to treat. Some strains have become very resistant to antibiotics by using their unique ability to transform their genes and cell wall into a bacterial form, which is resistant to most of the antibiotics that commonly are used to treat ear infections. These resistant strains frequently are cultured from children who do not respond to several courses of antibiotics. When a child has an ear infection that does not respond to antibiotics, resistant pneumococcus bacteria may cause it.