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[Dolosigranulum pigrum in corneal abscess].

Karina L Roitman1, Marisa N Almuzara2, Mario Javier Fernández Rodriguez1

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Dolosigranulum pigrum, a common bacterium, can cause severe corneal abscesses, particularly in elderly individuals. This case highlights the importance of identifying this often-overlooked pathogen in serious eye infections.

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Area of Science:

  • Microbiology
  • Ophthalmology
  • Infectious Diseases

Background:

  • Dolosigranulum pigrum is a gram-positive coccus found in the oral and respiratory tracts.
  • While typically commensal, it has been linked to various infections, though rarely reported.

Observation:

  • A case study involving an elderly male patient with a lower corneal abscess is presented.
  • Dolosigranulum pigrum was successfully isolated from the patient's corneal abscess.

Findings:

  • Microorganism identification was confirmed using MALDI-TOF MS and 16S rRNA gene sequencing.
  • Phenotypic tests including Gram stain, catalase, enzyme activities, salt tolerance, and esculin hydrolysis aided presumptive identification.

Implications:

  • This case, along with literature data, supports Dolosigranulum pigrum's association with ocular infections.
  • Such infections can be destructive, especially in elderly patients, necessitating prompt diagnosis and treatment.