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Effect of Temperature on the Killing of Opisthorchis viverrini Eggs In Vitro
Parichart Boueroy,Kunyarat Duenngai,Chatanun Eamudomkarn,Panupan Sripan,Thidarut Boonmars,Benjamabhorn Pumhirunroj,Atchara Artchayasawat,Jiraporn Songsri,Kanpicha Chomphumee,Panaratana Rattanasuwan,Po 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.1
Contaminated liver fluke egg in the environment has led to the high prevalence of human opisthorchiasis asso- ciated with cholangiocarcinoma in Southeast Asia. To find the effective lessening methods of Opisthorchis viverrini eggs in the contaminated environment, we investigated the temperature conditions for killing of these trematode eggs in vitro. Numerous O. viverrini eggs were obtained in the proximal part of uteri of adult worms from experimental hamsters. Ma- ture eggs with miracidium were allocated by experimental groups (2 control: positive and negative and 4 treatment: 50, 60, 70, and 80°C) with 0.85% saline, and treated by the experimental plan. Eggs in each experimental groups were ob- served under the confocal microscope after stain with Propidium Iodide (PI) to evaluate the effect of temperatures. Eggs in 70 and 80°C groups were all killed after over 10 min heated. Majority of eggs in 60°C (10, 15, and 30 min heated), 70 and 80°C (5 min heated) groups were inactivated. However in 50°C group, below half of eggs were to be killed in all time lapse (10, 15 and 30 min). In order to prevent O. viverrini infection and cholangiocarcinoma, direct treatment of sewage by heating at 70 or 80°C at least 10 min is essential. Therefore, treatment of O. viverrini eggs at a high temperature is a po- tential method for controlling egg contamination in sewage.