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Abstract:
The electron microscopic appearances of grains from seven patients with pale grain eumycetoma infections have been studied. The infecting fungi were Pseudallescheria boydii (2), Fusarium sp. (1), Acremonium kiliense (1), a non-sporing mould (2) and Trichophyton violaceum (1). P. boydii grown in vitro and grains from a Madurella mycetomatis infection were used for comparison. The most important ultrastructural features of the pale eumycetoma grains were the gross thickening of the fungal cell walls maximal at the periphery of the grain, the predominance of grossly disorganised hyphae and the appearance of cytoplasmic membrane systems. In some areas adjacent cell walls appeared to fuse. These changes may account for some of the well recognised difficulties in isolating organisms from eumycetoma grains and treating the infections with antifungal drugs.
Insights
Electron microscopy revealed key ultrastructural changes in pale grain eumycetoma, including thickened cell walls and disorganized hyphae. These fungal alterations may explain treatment challenges for eumycetoma infections.
Area of Science:
- Medical Mycology
- Electron Microscopy
- Infectious Diseases
Background:
- Eumycetoma is a chronic fungal infection.
- Pale grain eumycetoma presents unique diagnostic and therapeutic challenges.
- Understanding the ultrastructure of causative agents is crucial.
Purpose of the Study:
- To investigate the ultrastructural morphology of pale grain eumycetoma grains.
- To identify characteristic fungal changes associated with this infection.
- To correlate ultrastructural findings with clinical challenges.
Main Methods:
- Electron microscopy was used to examine fungal grains from seven patients.
- Infecting fungi included Pseudallescheria boydii, Fusarium sp., Acremonium kiliense, a non-sporing mould, and Trichophyton violaceum.
- In vitro grown P. boydii and Madurella mycetomatis grains were used for comparison.
Main Results:
- Significant thickening of fungal cell walls, particularly at the periphery, was observed.
- Predominance of grossly disorganized hyphae within the grains.
- Appearance of complex cytoplasmic membrane systems and apparent fusion of adjacent cell walls.
Conclusions:
- The observed ultrastructural features of pale eumycetoma grains may contribute to difficulties in organism isolation.
- These fungal modifications could also explain the challenges in treating eumycetoma with antifungal drugs.
- Further research into these ultrastructural changes is warranted for improved therapeutic strategies.