Efficacy of Some Disinfectants on Embryonated Eggs of Toxocara canis

Authors: HASAN AYÇİÇEK, ENDER YARSAN, H. OĞUZ SARIMEHMETOĞLU, MEHMET TANYÜKSEL, NOGAY GİRGİNKARDEŞLER, MUSTAFA ÖZYURT

Abstract: The aim of this study was to evaluate the efficacy of various disinfectants in different concentrations against embryonated Toxocara canis eggs. For this purpose, 2.5%, 5%, 7.5%, and 10% iodine, 2% glutaraldehyde, 10% benzalkonium chloride, 7% sodium hypochloride, 1% potassium permanganate, 70% ethyl alcohol, 10% potassium hydroxide and 3% phenol solutions were used as the disinfectants. This study was performed both in vitro and in-vivo. In the in vitro experiment, T. canis eggs were treated with disinfectant solutions in different time intervals, and larval motility was observed under X400 magnification with an inverted microscope. Microscopic examinations revealed that T. canis eggs treated in 2.5%, 5%, 7.5%, and 10% iodine solutions were completely non-motile at 120, 60, 40, and 40 minutes post-treatment respectively, whereas the eggs treated in the all other disinfectants were still motile after 24 hours. In the in-vivo study, 1000 embryonated eggs treated with disinfectants were inoculated each mouse via the oral route, and their brain tissues were examined for larval presence on the 7th day post-inoculation. In addition, a control group was set up for comparison with the study groups. No T. canis larvae were observed in mice inoculated with eggs treated with any of the iodine solutions. However, larvae were observed in the other study groups inoculated with eggs treated with the other disinfectants. These results showed that only the iodine disinfectants produced a statistically significant difference (p<0.001) according to the Chi square (X2) test. Thus, iodine disinfectant solutions were found to be effective against embryonated eggs of T. canis.

Keywords: Toxocara canis, disinfectants, efficiency

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