Pathogens causing recurrent and difficult-to-treat acute otitis media, 2003-2006

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Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria
11:32

Following in Real Time the Impact of Pneumococcal Virulence Factors in an Acute Mouse Pneumonia Model Using Bioluminescent Bacteria

Published on: February 23, 2014

Michael E Pichichero1, Janet R Casey, Alejandro Hoberman

  • 1University of Rochester Medical Center and Legacy Pediatrics, Rochester, New York 14642, USA. michael_pichichero@urmc.rochester.edu

Clinical Pediatrics
|June 19, 2008
PubMed

Insights

The heptavalent pneumococcal conjugate vaccine (PCV7) impacted acute otitis media (AOM) microbiology. While Haemophilus influenzae remains common, penicillin-nonsusceptible Streptococcus pneumoniae are reemerging in AOM treatment failure and recurrent AOM cases.

Area of Science:

  • Pediatric Infectious Diseases
  • Vaccinology
  • Microbiology

Background:

  • The heptavalent pneumococcal conjugate vaccine (PCV7) has been widely used since 2000.
  • Recurrent acute otitis media (AOM) and AOM treatment failure (AOMTF) remain significant pediatric challenges.
  • Understanding the evolving microbiology of AOM is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the microbiological landscape of recurrent AOM and AOMTF following widespread PCV7 implementation.
  • To compare the prevalence of key bacterial pathogens and their antimicrobial resistance patterns over three respiratory seasons.

Main Methods:

  • Retrospective cohort study analyzing 244 AOM isolates from tympanocentesis.
  • Isolates were collected from geographically diverse pediatric populations during 2003-2006.
  • Microbiological analysis included pathogen identification and antimicrobial susceptibility testing.

Main Results:

  • Haemophilus influenzae was the most frequently isolated pathogen in AOMTF and recurrent AOM cases.
  • The proportion of Streptococcus pneumoniae isolates showed an increasing trend (35% to 46%) over the study period.
  • Penicillin-nonsusceptible S. pneumoniae (PNSP) and beta-lactamase-producing H. influenzae remained prevalent.

Conclusions:

  • Despite PCV7 use, H. influenzae continues to be a primary pathogen in complicated AOM.
  • Penicillin-nonsusceptible S. pneumoniae are reemerging as significant contributors to recurrent AOM and treatment failure.
  • Ongoing surveillance of AOM microbiology and resistance patterns is essential.

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