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Author Spotlight: Studying Behavior of Acanthamoeba to Develop Targeted Strategies for Preventing Acanthamoeba Keratitis
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The Acanthamoeba-Fungal Keratitis Study.

Anita Raghavan1, Shaffie Baidwal1, Narendran Venkatapathy1

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Acanthamoeba keratitis coinfections with fungi are more common than previously thought, occurring in 4.5% of cases. These infections are not limited to contact lens wearers and require prompt diagnosis for effective treatment.

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Area of Science:

  • Ophthalmology
  • Microbiology
  • Infectious Diseases

Background:

  • Microbial keratitis is a significant cause of vision loss.
  • Acanthamoeba keratitis is a severe form of microbial keratitis.
  • Fungal keratitis is another important cause of microbial keratitis.

Purpose of the Study:

  • To determine the incidence of Acanthamoeba keratitis.
  • To investigate the co-occurrence of Acanthamoeba and fungi in microbial keratitis cases.
  • To identify clinical signs associated with Acanthamoeba coinfections.

Main Methods:

  • Prospective cross-sectional study design.
  • Patients with stromal keratitis were tested for Acanthamoeba.
  • Microbial culture positivity served as the gold standard for diagnosis.

Main Results:

  • Acanthamoeba was detected in 10% of 401 microbial keratitis cases.
  • Acanthamoeba and fungal coinfection occurred in 4.5% of cases.
  • Ring infiltrates, often yellowish with hyphate edges, were more common in Acanthamoeba-fungal coinfections.

Conclusions:

  • Acanthamoeba coinfections, particularly with fungi, are frequent and not exclusive to contact lens users.
  • Recognizing coinfections is crucial for accurate diagnosis and timely treatment.
  • Early anticipation of coinfections aids in appropriate therapeutic interventions.