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Related Experiment Videos

Coryneform bacteria isolated from middle ear fluid

M Simonet1, D De Briel, I Boucot

  • 1Laboratoire de Microbiologie, Faculté de Médecine Necker-Enfants Malades, Paris, France.

Journal of Clinical Microbiology
|June 1, 1993
PubMed
Summary
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New bacteria, ANF-1 like, were identified in middle ear fluid from children with acute otitis media. These gram-positive rods may be involved in causing this common infection.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Otology

Background:

  • Acute otitis media (AOM) is a common childhood infection.
  • The causative agents of AOM are diverse, and novel pathogens are continually being discovered.

Purpose of the Study:

  • To identify and characterize novel bacterial strains isolated from middle ear effusions in children with AOM.
  • To determine the potential role of these novel bacteria in the pathogenesis of AOM.

Main Methods:

  • Bacterial strains were isolated from middle ear fluid samples obtained via tympanocentesis.
  • Microbial identification involved analysis of cell wall composition, including the presence of meso-diaminopimelic acid, arabinogalactan, and mycolic acids.

Main Results:

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  • Nineteen strains of facultatively anaerobic, gram-positive rods were isolated.
  • Sixteen strains lacked mycolic acids but contained meso-diaminopimelic acid and arabinogalactan, suggesting they represent a new taxon.
  • These novel strains were temporarily classified as ANF-1 like due to similarities with Corynebacterium afermentans (CDC group ANF-1).

Conclusions:

  • The isolation of these novel ANF-1 like bacteria in pure culture from middle ear fluids strongly suggests their involvement in acute otitis media.
  • Further research is warranted to fully characterize these organisms and their role in AOM pathogenesis.