Ten-Year Study of Acute Otitis Media in Rochester, NY

Area of Science:

• Pediatric infectious diseases
• Microbiology
• Immunology

Background:

• Acute otitis media (AOM) remains a significant childhood illness.
• Understanding otopathogen dynamics and host responses is crucial for prevention and treatment.
• Longitudinal studies tracking pathogen shifts and immune responses are vital.

Purpose of the Study:

• To investigate otopathogen colonization, AOM development, and host immune responses over a decade.
• To analyze the impact of pneumococcal conjugate vaccine (PCV13) on AOM etiology.
• To identify biomarkers predicting AOM presence, recovery, and causative pathogens.

Main Methods:

• Prospective, longitudinal study of 760 children over 10 years.
• Bacterial culture of middle ear fluid for AOM confirmation and otopathogen identification.
• Nasopharyngeal (NP) swabbing for colonization patterns.
• Analysis of serum cytokines and peripheral blood mononuclear cell transcriptomes.

Main Results:

• PCV13 introduction led to a decrease in vaccine-type Streptococcus pneumoniae (Spn) AOM, with subsequent increases in non-vaccine Spn types and nontypeable Haemophilus influenzae (NTHi).
• NTHi and Spn predominated over Moraxella catarrhalis in co-colonization and AOM causation.
• Elevated serum cytokines (S100A12, ICAM-1, IL-10) predicted AOM presence, recovery, and pathogen type.
• Transcriptome analysis revealed distinct immune signatures for NTHi AOM versus Spn AOM.
• Nasopharyngeal colonization was found to be an immunizing event.

Conclusions:

• Vaccine-preventable pneumococcal serotypes decreased, but shifts to non-vaccine types and NTHi occurred.
• Specific serum cytokines serve as reliable biomarkers for AOM diagnosis and prognosis.
• Nasopharyngeal colonization plays a critical role in developing immunity against AOM pathogens.