Concurrent otitis media & conjunctivitis is likely due to which organism?

Concurrent otitis media & conjunctivitis is likely due to which organism?

• A. Haemophilus influenzae
• B. Streptococcus pneumoniae
• C. Moraxella catarrhalis
• D. Staphylococcus aureus

Answer: (A)

When infections spread across mucosal surfaces in kids, certain bacteria that colonize the nasopharynx are classic culprits for involving multiple sites at once. Non-typeable Haemophilus influenzae is the classic offender when otitis media occurs together with conjunctivitis because it readily colonizes the nasopharynx and can move to both the middle ear via the Eustachian tube and the conjunctiva. This organism is a gram-negative coccobacillus that lacks a capsule, which helps it thrive on mucosal surfaces and cause mucosal infections rather than invasive disease. The Hib vaccine reduces serious Hib infections, but non-typeable strains still commonly cause mucosal infections like AOM and conjunctivitis, making this combination most consistent with Haemophilus influenzae. Moraxella catarrhalis can cause both conditions as well, but the concurrent presentation is more classically linked to Haemophilus influenzae. Streptococcus pneumoniae is a major cause of acute otitis media, but it is less typically associated with conjunctivitis, and Staphylococcus aureus is not a common etiologic agent for this dual presentation.

When infections spread across mucosal surfaces in kids, certain bacteria that colonize the nasopharynx are classic culprits for involving multiple sites at once. Non-typeable Haemophilus influenzae is the classic offender when otitis media occurs together with conjunctivitis because it readily colonizes the nasopharynx and can move to both the middle ear via the Eustachian tube and the conjunctiva.

This organism is a gram-negative coccobacillus that lacks a capsule, which helps it thrive on mucosal surfaces and cause mucosal infections rather than invasive disease. The Hib vaccine reduces serious Hib infections, but non-typeable strains still commonly cause mucosal infections like AOM and conjunctivitis, making this combination most consistent with Haemophilus influenzae.

Moraxella catarrhalis can cause both conditions as well, but the concurrent presentation is more classically linked to Haemophilus influenzae. Streptococcus pneumoniae is a major cause of acute otitis media, but it is less typically associated with conjunctivitis, and Staphylococcus aureus is not a common etiologic agent for this dual presentation.