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Updated: Mar 17, 2026
Author Spotlight: Studying Behavior of Acanthamoeba to Develop Targeted Strategies for Preventing Acanthamoeba Keratitis
Published on: September 20, 2024
Microwave Irradiation as a Promising Method of Sterilization for Acanthamoeba polyphaga in Cultures
Yukihiro Matsumoto1, Osama M A Ibrahim, Takashi Kojima
1*Department of Ophthalmology, Keio University School of Medicine, Tokyo, Japan; and †Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital, Chiba, Japan.
Purpose:
To determine the killing effect of microwave irradiation on Acanthamoeba polyphaga.
Methods:
The trophozoites and cysts of A. polyphaga both in water and on agar were exposed to microwave irradiation with a capacity of 750 W for 0, 1, 3, 5, and 10 minutes, respectively. Furthermore, the trophozoites and cysts of A. polyphaga in water were exposed to microwave irradiation with a capacity of 100, 300, and 500 W for 1 minute, respectively.
Results:
The trophozoites and cysts of A. polyphaga on agar were completely killed by 3 minutes of microwave irradiation with a capacity of 750 W. The trophozoites and cysts of A. polyphaga in water were completely killed by microwave irradiation with a capacity of 300 W for 1 minute.
Conclusions:
We demonstrate that microwave treatment is effective in killing A. polyphaga both in water and on agar and may be a helpful modality to prevent Acanthamoeba keratitis.
Insights
Microwave irradiation effectively kills Acanthamoeba polyphaga (A. polyphaga) in both water and on agar. This method shows promise for preventing Acanthamoeba keratitis, an eye infection.
Area of Science:
- Microbiology
- Biophysics
- Ophthalmology
Background:
- Acanthamoeba polyphaga is an opportunistic pathogen.
- Acanthamoeba keratitis is a serious eye infection.
- Effective sterilization methods are needed to combat A. polyphaga.
Purpose of the Study:
- To evaluate the efficacy of microwave irradiation in eliminating Acanthamoeba polyphaga.
- To determine the optimal conditions for microwave-induced A. polyphaga inactivation.
Main Methods:
- Trophozoites and cysts of A. polyphaga were exposed to microwave irradiation (750 W) for varying durations (0-10 minutes) on agar and in water.
- Inactivation was also tested at different power levels (100-500 W) for 1 minute in water.
Main Results:
- Complete killing of A. polyphaga on agar was achieved with 750 W microwave irradiation for 3 minutes.
- Complete inactivation of A. polyphaga in water occurred at 300 W for 1 minute.
Conclusions:
- Microwave irradiation is a potent method for eradicating A. polyphaga.
- This technique may serve as a valuable tool in preventing Acanthamoeba keratitis.
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