Parasite egg contamination of water and air in a suburban area of Hanoi, Vietnam
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概要
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Contamination of water and air by soil-transmitted helminth eggs was investigated in a small village located in the suburbs of Hanoi, Vietnam. Water samples were collected from 29 households, two schools, two kindergartens, one restaurant, three ponds and 23 ditch sites during the rainy season. Water samples were also collected at the same places, except for one household and one restaurant, during the dry season. The water samples collected from households, schools, kindergartens and restaurant were comprised of well-water and rain-water. These samples included both water filtrated with sand and gravel and non-filtrated water. Two-liter water samples were examined for helminth eggs by either a centrifugation or flotation method. The contamination of air by helminth eggs was assessed by the method of Kroeger et al. (1992). Eggs in air were trapped on adhesive tapes hanging in rooms and in the area around 29 houses, two schools, two kindergartens, one restaurant and 18 utility poles. Out of 63 water samples collected from households in the rainy season, helminth eggs were found in four water samples; one from non-filtrated well-water and three from filtrated well-water samples. The one non-filtrated water sample contained six eggs of Toxocara sp., while the three filtrated water samples contained one egg each of Trichuris sp., Trichiuris sp. and Taenia sp. No eggs were found in the water samples collected from schools, kindergartens or the restaurant in the rainy season. All water samples collected from ponds and ditches in the rainy season contained many helminth eggs. The eggs found were Ascaris sp., Trichuris sp., Toxocara sp., Ascaridia galli, hookworm, Taenia sp. and Fasciola sp. Examination of the adhesive tapes hanging in the air showed that four sites were contaminated by helminth eggs, i. e. one site near the house, two sites near the school and one site at a utility pole. The species of eggs found were Trichuris sp., Ascaridia galli and Taenia sp. The number of eggs found on tapes was only one or two. In the dry season, a few samples of well-water and rain-water collected from the residential area were contaminated with helminth eggs, and all samples collected from ponds and ditches contained many eggs of various species similar to those collected in the rainy season. The present study clearly indicates that, in our study area, the villagers were subject to infection from soil-transmitted helminthes directly and indirectly through water.
- 日本熱帯医学会,The Japanese Society of Tropical Medicineの論文
- 2009-06-01
著者
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Hoa Nguyen
National Institute of Hygiene & Epidemiology
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Thuan Le
National Institute of Malariology, Parasitology and Entomology
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Thuan Le
National Institute Of Malariology Parasitology And Entomology
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Thuan Le
長崎大学熱帯医学研究所 寄生行動制御分野
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Nguyen Thi
愛媛大学 医学系研究科統合医科学
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NODA Shinichi
Research Center for the Pacific Islands, Kagoshima University
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Hoa Nguyen
National Institute Of Malariology Parasitology And Entomology
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Uga Shoji
Department of Medical Technology, Faculty of Health Sciences, Kobe University
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Aoki Yoshiki
Department of Parasitology, Institute of Tropical Medicine, Nagasaki University
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Fujimaki Yasunori
Department of Parasitology, Institute of Tropical Medicine, Nagasaki University
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Uga Shoji
Department Of Parasitology Faculty Of Health Sciences Kobe University Graduate School Of Health Scie
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Noda Shinichi
Research Center For The Pacific Islands Kagoshima University
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FUJIMAKI Yasunori
Fujimaki Dermatology Urology Clinic
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Thuan Le
Research Center For The Pacific Islands Kagoshima University
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Fujimaki Yasunori
Department Of Parasitology Institute Of Tropical Medicine Nagasaki University
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Aoki Yoshiki
Dep. Of Parasitology Inst. Of Tropical Medicine Nagasaki Univ.
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Aoki Yoshiki
Department Of Parasitology Institute For Tropical Medicine Nagasaki University
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Uga Shoji
Department Of Medical Technology (faculty Of Health Science) Kobe University School Of Medicine
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AOKI Yoshiki
Department of Agricultural Chemistry, Gifu University
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