Parasites, Hosts and Diseases

"Kunyarat Duenngai"

Brief Communication

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, Porntip Laummaunwai, Sukhonthip Khueangchiangkhwang, Sirintip Boonjaraspinyo; Korean J Parasitol 2019;57(1):49-53.
Published online February 26, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.1.49

Abstract
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Contaminated liver fluke egg in the environment has led to the high prevalence of human opisthorchiasis associated 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. Mature 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 observed 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 potential method for controlling egg contamination in sewage.

Citations

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Development of a Dielectric Heating System for Selective Thermal Targeting of Liver Fluke Regions in Cirrhinus microlepis
Supatinee Kornsing, Sirigiet Phunklang, Chanchai Thongsopa, Piyaporn Krachodnok, Nuchanart Santalunai, Samran Santalunai
Applied Sciences.2025; 15(10): 5466. CrossRef
Viability of Trichinella spiralis in traditional sour pork fermentation and its inactivation by microwave heating: Implications for zoonotic risk and food safety
Atchara Artchayasawat, Benjamabhorn Pumhirunroj, Sukhonthip Khueangchiangkhwang, Thidarut Boonmars, Parichart Boueroy, Porntip Laummaunwai, Panaratana Rattanasuwan
Veterinary World.2025; : 1660. CrossRef

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Original Article

Zoonotic Echinostome Infections in Free-Grazing Ducks in Thailand: Weerachai Saijuntha, Kunyarat Duenngai, Chairat Tantrawatpan; Korean J Parasitol 2013;51(6):663-667.
Published online December 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.6.663

Abstract
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Free-grazing ducks play a major role in the rural economy of Eastern Asia in the form of egg and meat production. In Thailand, the geographical location, tropical climate conditions and wetland areas of the country are suitable for their husbandry. These environmental factors also favor growth, multiplication, development, survival, and spread of duck parasites. In this study, a total of 90 free-grazing ducks from northern, central, and northeastern regions of Thailand were examined for intestinal helminth parasites, with special emphasis on zoonotic echinostomes. Of these, 51 (56.7%) were infected by one or more species of zoonotic echinostomes, Echinostoma revolutum, Echinoparyphium recurvatum, and Hypoderaeum conoideum. Echinostomes found were identified using morphological criteria when possible. ITS2 sequences were used to identify juvenile and incomplete worms. The prevalence of infection was relatively high in each region, namely, north, central, and northeast region was 63.2%, 54.5%, and 55.3%, respectively. The intensity of infection ranged up to 49 worms/infected duck. Free-grazing ducks clearly play an important role in the life cycle maintenance, spread, and transmission of these medically important echinostomes in Thailand.

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