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Survey of Angiostrongylus cantonensis in rats and giant African land snails in Phitsanulok province,Thailand

Asian Pacific Journal of Tropical Medicine 2011年第8期4卷 597-599页

作者： Apichat Vitta raxsina polseela Seangchai Nateeworanart Muncharee Tattiyapong Department of Microbiology & Parasitology Faculty of Medical ScienceNaresuan UniversityPhitsanulok 65000Thailand Department of Medical Technology Faculty of Allied Health SciencesNaresuan UniversityPhitsanulok 65000Thailand National Institute of Animal Health Department of Livestock Development.Ministry of Agriculture and CooperativesChatuchakBangkok 10900Thailand

Objective:To survey the Angiostrongylus cantonensis(***) or the rat lungworm in a rat,definitive host,and in a giant African land snail(Achatina fulica),the intermediate host,in Phitsanulok,***:Rats and giant African land snails were captured from Tha Pho sub-district,Phitsanulok,*** were killed and examined for adult ***. The artificial digestion method following Baermann technique were used for isolation third stage larvae of ***:Sixty-two rats were captured and they were identified as Rattus argentiventer,Rattus rattus(***),Bandicota savilei,and Bandicota indica but only one animal(***) of 62 rats(1.61%) was positive with adult worm of *** third stage larvae of *** were examined on 307 Angiostrongylus fulica *** was found that the overall infection rate was 12.38%(38 infected out of 307 Achatina snails).Conclusions: This study demonstrates that *** is available in the natural hosts of *** suggests that the transmissions of this parasite to human may occur in this region.

关键词： Angiostrongylus cantonensis Rattus rattus Achatina fulica

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Larvicidal activity of Xenorhabdus and Photorhabdus bacteria against Aedes aegypti and Aedes albopictus

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Asian Pacific Journal of Tropical Biomedicine 2018年第1期8卷 31-36页

作者： Apichat Vitta Punnawat Thimpoo Wipanee Meesil Thatcha Yimthin Chamaiporn Fukruksa raxsina polseela Bandid Mangkit Sarunporn Tandhavanant Aunchalee Thanwisai Department of Microbiology and Parasitology Faculty of Medical Science Naresuan University Centre of Excellence in Medical Biotechnology Naresuan University Department of Microbiology and Immunology Faculty of Tropical Medicine Mahidol University Department of Veterinary Technology Faculty of Veterinary Technology Kasetsart University

Objective: To evaluate the efficacy of symbiotic bacteria, Xenorhabdus indica, Xenorhabdus stockiae, Photorhabdus luminescens subsp. akhurstii and Photorhabdus luminescens subsp. hainanensis as a larvicide against Aedes aegypti and Aedes albopictus. Methods: Larvae(L3-L4) of Aedes aegypti and Aedes albopictus were given 2 m L of a suspension 107-108 CFU/m L of each symbiotic bacterium. Distilled water and Escherichia coli ATCC襅25922 were used as the control. The mortality rate of the larval mosquitoes was observed at 24, 48, 72 and 96 h. The experiment was performed in triplicates. Results: The larvae of both Aedes species started to die at 24 h exposure. Aedes aegypti showed the highest mortality rate(87%-99%), 96 h after exposure to Xenorhabdus stockiae(b NBP22.2_TH). The mortality rate of Aedes albopictus was between 82% and 96% at 96 h after exposure to Xenorhabdus indica(b KK26.2_TH). Low effectiveness of distilled water and Escherichia coli ATCC襅25922 were observed in both Aedes larvae, with a mortality rate of 2% to 12%. Conclusions: The study confirms the oral toxicity of Xenorhabdus and Photorhabdus bacteria against Aedes spp. Xenorhabdus stockiae and Xenorhabdus indica may be an alternative agent for control Aedes spp. This is basic information for further study on the mechanism of action on Aedes larvae or application to control mosquito larvae in the community.

关键词： Aedes aegypti Aedes albopictus Photorhabdus Xenorhabdus Larvicidal activity

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Presence of Cryptosporidium parvum and Giardia lamblia in water samples from Southeast Asia: towards an integrated water detection system

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Infectious Diseases of Poverty 2016年第1期5卷 15-26页

作者： Thulasi Kumar Mohamad Azlan Abd Majid Subashini Onichandran Narong Jaturas Hemah Andiappan Cristina C.Salibay Hazel A.L.Tabo Norbel Tabo Julieta Z.Dungca Jitbanjong Tangpong Sucheep Phiriyasamith Boonyaorn Yuttayong raxsina polseela Binh Nhu Do Nongyao Sawangjaroen Tian-Chye Tan Yvonne A.L.Lim Veeranoot Nissapatorn Department of Parasitology(Southeast Asia Water Team) Faculty of MedicineUniversity of MalayaKuala LumpurMalaysia Biological Science Department College of Science and Computer StudiesDe La Salle University-DasmariñasDasmariñasPhilippines School of Science and Technology Centro Escolar UniversityManilaPhilippines School of Allied Health Sciences and Public Health Walailak UniversityNakhon Si ThammaratThailand. Graduate School Kasem Bundit UniversityBangkokThailand. Regional Medical Sciences Center Department of Medical SciencesMinistry of Public HealthNakhon RatchasimaThailand. Department of Microbiology and Parasitology Faculty of Medical ScienceNaresuan UniversityPhitsanulokThailand. Department of Parasitology Faculty of MedicineVietnam Military Medical University160 Phung Hung RoadPhuc La WardHa Dong DistrictHanoiVietnam Department of Microbiology Faculty of SciencePrince of Songkla UniversityHat YaiThailand

Background:Access to clean and safe drinking water that is free from pathogenic protozoan parasites,especially Cryptosporidium parvum and Giardia lamblia that cause gastrointestinal illness in humans,is still an issue in Southeast Asia(SEA).This study is the first attempt to detect the aforementioned protozoan parasites in water samples from countries in SEA,using real-time polymerase chain reaction(qPCR)***:A total of 221 water samples of 10 l each were collected between April and October 2013 from Malaysia(53),Thailand(120),the Philippines(33),and Vietnam(15).A physicochemical analysis was *** water samples were processed in accordance with the US Environmental Protection Agency’s methods 1622/1623.1,microscopically observed and subsequently screened using qPCR ***:Cryptosporidium oocysts were detected in treated water samples from the Philippines(1/10),with a concentration of 0.06±0.19 oocyst/L,and untreated water samples from Thailand(25/93),Malaysia(17/44),and the Philippines(11/23),with concentrations ranging from 0.13±0.18 to 0.57±1.41 oocyst/*** cysts were found in treated water samples from the Philippines(1/10),with a concentration of 0.02±0.06 cyst/L,and in untreated water samples from Thailand(20/93),Vietnam(5/10),Malaysia(22/44),and the Philippines(16/23),with concentrations ranging from 0.12±0.3 to 8.90±19.65 cyst/*** pathogens *** and *** were detected using using qPCR assays by targeting the 138-bp fragment and the small subunit gene,*** was detected in untreated water samples from the Philippines(1/23)and Malaysia(2/44),whilst,*** detected was detected in treated water samples from the Philippines(1/10)and in untreated water samples from Thailand(21/93),Malaysia(12/44),and the Philippines(17/23).Nitrate concentration was found to have a high positive correlation with(oo)cyst(0.993).Conclusion:The presence of(oo)cysts in the water samples means that there is potential risk for

关键词： Cryptosporidium parvum Giardia lamblia Physicochemical Microscopy Real-time polymerase chain reaction Southeast Asia

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