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Effects of physicochemical factors on development and survival of Opisthorchis viverrini uterine eggs

Asian Pacific Journal of Tropical Biomedicine 2018年第9期8卷 431-435页

作者： Chanisala Sereewong Monticha Chaiyasaeng Naiyana Senasri jukkrid chaiyos Smarn Tesana Food-borne Parasite Research Group Department of Parasitology Faculty of Medicine Khon Kaen University Department of Fisheries Faculty of Natural Resources Rajamangala University of Technology Isan Sakonnakhon Campus

Objective: To investigate the maturity development of miracidia in uterine eggs from four portions of the Opisthorchis viverrini uterus and environmental factors possibly affected in maturation and infectivity of distal part uterine ***: Uteri of adult worms were divided into 4 equal *** of eggs was determined under light *** embryonated eggs were used to evaluate the effects of physicochemical factors: temperature, salinity, acidity, ultraviolet A, B, *** success was evaluated by feeding treated eggs to intermediate host snails and determining by using a PCR ***: Eggs obtained from the uterus closest to the ovary(regions 1 and 2) failed to develop in *** from region 4 of the uterus(close to the genital pore) were used to study effects of physicochemical *** highest survival and infection success was in groups of eggs kept at 30 ℃(95.20%).The calculated period of loss infection success(LI_(50) and LI_(95)) on miracidia in distal uterine eggs by exposure to UV-A, UV-B and UV-C were 73 and 1 523 d; 8 and 20 d; 1 and 2 d, *** concentrations(LC_(50) and LC_(95)) of salinity, HCl and NaOH on miracidia in distal uterine eggs were 45.43 and 120.09 ppt, 0.01 and 0.25 M; 0.01 and 0.11 M, respectively, after 24 h ***: Opisthorchis viverrini eggs display a high tolerance to environmental conditions, especially after snail host eating for infection.

关键词： Opisthorchis viverrini Physicochemical Development Survival Uterine eggs

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Effects of albendazole,artesunate,praziquantel and miltefosine,on Opisthorchis viverrini cercariae and mature metacercariae

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Asian Pacific Journal of Tropical Medicine 2017年第2期10卷 120-126页

作者： Phornphitcha Pechdee Monticha Chaiyasaeng Chanisala Sereewong jukkrid chaiyos Apiporn Suwannatrai Sutee Wongmaneeprateep Smarn Tesana Food-Borne Parasite Research Group Department of ParasitologyFaculty of MedicineKhon Kaen University Department of Fisheries Faculty of AgricultureKhon Kaen University

Objective:To explore larvicidal effects of anthelmintic drugs on Opisthorchis viverrini(***) for alternative approach to interrupting its cycle for developing a field-based control ***:The larvicidal activities of albendazole(A1),artesunate(Ar),praziquantel(Pzq) and miltefosine(Mf) on *** cercariae and mature metacercariae were *** concentrations(LC_(50) and LC_(95)) of these drugs were *** metacercariae previously exposed to various concentrations of the drugs were administered to *** were harvested 30 d post infection and worm recovery rates ***,Ar,Pzq and Mf produced morphological degeneration and induced shedding tails of cercariae after 24 h ***:The LC_(50) and LC_(95) of Al,Ar,Pzq and Mf on cercariae were 0.720 and 1.139,0.350 and 0.861,0.017 and 0.693,and 0.530 and 1.134 ppm,***_(50) and LC_(95) of Ar on mature metacercariae were 303.643 and 446.237 ppm and of Mf were 289.711 and 631.781 ppm,respectively but no lethal effect in Pzq-and Al-treated groups(up to 1 ppt).No worms were found in hamsters administered Pzq-treated *** adult worms from Al-treated metacercariae were significantly bigger in size compared to the control group(P<0.05).Fecundity and body width were greater in adults from Mf-treated metacercariae compared to the control group(P<0.05).Conclusions:The larvicidal effects of these drugs were high efficacy to *** cercariae but lesser efficacy to *** should be further studied with the eventual aim of developing a field-based control program.

关键词： Albendazole Artesunate Praziquantel Miltefosine Opisthorchis viverrini Cercariae

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