Two commonly used disinfectants, a quaternary ammonium salt and povidone-iodine, were tested for effectiveness against unembryonated Ascaris suum eggs. The quaternary ammonium salt (alkyl dimethyl benzyl ammonium chloride) had no effect on the Ascaris eggs (10 minutes and 22°C) when compared with the controls in water with egg viabilities of 88.8% ± 3.3% and 86.9% ± 6.2%, respectively. An additional quaternary ammonium salt, 2.5% benzethonium chloride, also had no effect. Phenol (5%) and cresol (3%) completely inactivated the eggs. Povidone-iodine at 100%, 50%, 10%, and 1% had no effect on the eggs at exposures of 5, 15, 30, 60, or 120 minutes (22°C) compared with the water controls.
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Published online: October 26, 2012
Conflict of interest: None to report.
Published by Elsevier Inc.
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- Inactivation of Ascaris suum eggsAmerican Journal of Infection ControlVol. 41Issue 9
- PreviewEditor, the recent report on inactivation of Ascaris suum eggs is very interesting.1 Labare et al concluded on ineffectiveness of a quaternary ammonium salt and povidone-iodine.1 Indeed, the parasite disinfectant is usually problematic in the tropical countries. The high resistance of several helminthes can be seen. The previous similar report also confirmed the same finding on ineffectiveness of studied disinfectants on A suum eggs.2 Therefore, the use of chemical disinfectants seems to be useless in infection control.