Khaled Mohamed El-Dakhly, Amany Samir Aboshinaf, Waleed Arafa, Lilian Nagy Mahrous, El-Shaymaa El-Nahass, Abdel-Tawab Gharib, Patricia Holman and Thomas Craig (2018).

Research Abstract

The effect of six available and commercial disinfectants on the embryonation and larval development of Toxascaris leonina eggs was studied. Dettol® and Virkon® both induced a 100% reduction in the larval development (P≤0.05).Dettol® resulted in deformed egg shells and a halt in embryonal development at one week post exposure. All Virkon® treated eggs showed an early embryonic lysis 24 hours post exposure. TH4+ and 70% ethanol both significantly (P≤0.05) affected the larval development with 58.8% and 85.8% reduction, respectively. Neither sodium hypochlorite nor phenol significantly affected the larval development (2.8% and 21.0%, respectively). Sodium hypochlorite treatment caused a visible decortication of the egg shell, however, phenol-treated embryonated Toxascaris eggs appeared more or less morphologically normal. In conclusion, the disinfectants tested induced variable degrees of decortication and suppression of the larval development. Virkon®S was the most effective disinfectant against Toxascaris eggs suggesting that it is the most advisable to use. To the best of our knowledge, this is the first report of the use of Virkon®S as an ovicidal and/or larvicidal of helminths, particularly Toxascaris leonina.

Research Keywords

Toxascaris leonina, cats, embryonation, larval development, disinfectant, Egypt