Parasites, Hosts and Diseases

The Korea Society for Parasitology and Tropical Medicine (대한기생충학·열대의학회)
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A Ten-year Survey of Giardia Cysts in Drinking Water Supplies of Seoul, the Republic of Korea

  • Received : 2010.10.13
  • Accepted : 2010.12.16
  • Published : 2011.03.15
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Abstract

To understand the distribution of Giardia cysts in drinking water supplies in Seoul, Korea, we collected water samples quarterly at 6 intakes in the Han River, its largest stream and 6 conventional water treatment plants (WTPs) serving drinking water, from 2000 to 2009. Giardia cysts in each of 10 L water were confirmed in 35.0% of intake water samples and the arithmetic mean was 1.65 cysts/10 L (range 0-35 cysts/10 L). The lowest cyst density was observed at Paldang and Kangbuk intakes, and the pollution level was higher at 4 intakes downstream. It seemed that these 4 intakes were under influence of Wangsuk stream at the end of which cysts were found in all samples with the mean of 140 cysts/10 L. The annual mean number of cysts was 0.21-4.21 cysts/10 L, and the cyst level at the second half of the 10 years was about 1/5 of that at first half on average. The cysts were more frequently found in winter, and their mean density was 3.74 cysts/10 L in winter and 0.80-1.08 cysts/10 L in other seasons. All finished water samples collected at 6 WTPs were negative for Giardia in each of 100 L sample for 10 years and cyst removal by physical process was average 2.9-log. It was concluded that conventional water treatment at 6 WTPs of Seoul appears to remove the cysts effectively under the present level of their source water. Domestic wastewater from the urban region could be an important source of Giardia pollution in the river.

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References

  1. deRegnier DP, Cole L, Schupp DG, Erlandsen SL. Viability of Giardia cysts suspended in lake, river, and tap water. Appl Environ Microbiol 1989; 55: 1223-1229.
  2. Craun GF. Waterborne outbreaks of giardiasis, current status. In Erlandsen SL and Meyer EA eds, Giardia and Giardiasis: Biology, Pathogenesis, and Epidemiology. New York, USA. Plenum Publishing Corp. 1984, p 243-261.
  3. Herwalt BL, Kramer HM, Craun GF, Calderon RL, Juranek DD. Waterborne diseases: 1993 and 1994. J Am Water Works Assoc 1996; 88: 66-79.
  4. USEPA. National Primary Drinking Water Regulations; Surface Water Treatment Rule 1989; 141.70-141.80.
  5. Schaefer FW 3rd, Johnson CH, Hsu CH, Rice EW. Determination of Giardia lamblia cyst infective dose for the Mongolian gerbil (Meriones unguiculatus). Appl Environ Microbiol 1991; 57: 2408-2409.
  6. Cho SH, Lee KY, Lee BC, Cho PY, Cheun HI, Hong ST, Sohn WM, Kim TS. Prevalence of clonorchiasis in southern endemic areas of Korea in 2006. Korean J Parasitol 2008; 46: 133-137. https://doi.org/10.3347/kjp.2008.46.3.133
  7. Cheun HI, Cho SH, Lee JH, Lim YY, Jeon JH, Yu JR, Kim TS, Lee WJ, Cho SH, Lee DY, Park MS, Jeong HS, Chen DS, Ji YM, Kwon MH. Infection status of hospitalized diarrheal patients with gastrointestinal protozoa, bacteria, and viruses in the Republic of Korea, Korean J Parasitol 2010; 48: 113-120. https://doi.org/10.3347/kjp.2010.48.2.113
  8. Huh JW, Moon SG, Lim YH. A survey of intestinal protozoan infections among gastroenteritis patients during a 3-year period (2004-2006) in Gyeonggi-do (Province), South Korea. Korean J Parasitol 2009; 47: 303-305. https://doi.org/10.3347/kjp.2009.47.3.303
  9. Kim CH, Na YE, Kim NM, Shin DW, Chang DY. Intestinal parasite and Clonorchis sinensis infection among the inhabitants in the upper stream of Taechong Dam, Kumgang (River). Korean J Parasitol 1994; 32: 207-214. https://doi.org/10.3347/kjp.1994.32.4.207
  10. Lee MY, Kim DY, Cho EJ, Lee EK, Oh SJ. Detection of Giardia and Cryptosporidium in water supplies in Seoul using Method 1623. J Korean Soc Water Qual 2000; 16: 595-608.
  11. Lee MY, Kim DY, Cho EJ, Lee EK, Oh SJ. Occurrence and characteristics of Cryptosporidium, Giardia and indicator bacteria from sewage treatment plants. In Autumn Conference of Korean Society on Water Quality and Korean Society on Water and Wastewater 2000; 73-76.
  12. USEPA. Method 1623: Cryptosporidium and Giardia in Water by Filtration/IMS/FA 1999; EPA 821-R-97-023.
  13. Rodgers MR, Flanigan DJ, Jakubowski W. Identification of algae which interfere with the detection of Giardia cysts and Cryptosporidium oocysts and a method for alleviating this interference. Appl Environ Microbiol 1995; 61: 3759-3763.
  14. USEPA. National Primary Drinking Water Regulations; Long Term II Enhanced Surface Water Treatment Rule (Pre-proposal draft for stakeholder review). 2001.
  15. Chauret C, Armstrong N, Fisher J, Sharma R, Springthorpe S, Satter S. Correlating Cryptosporidium and Giardia with microbial indicators. J Am Water Works Assoc 1995; 87: 76-83.
  16. Hashimoto A, Hirata T. Cryptosporidium oocysts and Giardia cysts in Sagami river and its tributaries. J Jap Soc Water Environ 1998; 21: 119-122. https://doi.org/10.2965/jswe.21.119
  17. Wallis PM, Erlandsen SL, Isaac-Renton JL, Olson ME, Robertson WJ, van Keulen H. Prevalence of Giardia cysts and Cryptosporidium oocysts and characterization of Giardia spp. isolated from drinking water in Canada. Appl Environ Microbiol 1996; 62: 2789-2797.
  18. Hashimoto A, Kunikane S, Hirata T. Prevalence of Cryptosporidium oocysts and Giardia cysts in the drinking water supply in Japan. Water Res 2002; 36: 519-526. https://doi.org/10.1016/S0043-1354(01)00279-2
  19. Niminski EC, Ongerth JE. Removing Giardia and Cryptosporidium by conventional treatment and direct filtration. J Am Water Works Assoc 1995; 87: 96-106.
  20. Cho EJ, Lee MY, Byun SH, Han SH, Ahn SK. Detection of Giardia lamblia in river water samples using PCR and RT-PCR. J Korean Soc Environ Eng 2007; 29: 904-908.
  21. Lee MY, Cho EJ, Lee JH, Han SH, Park YS. A survey of Cryptosporidium oocysts in water supplies during a 10-year period (2000-2009) in Seoul. Korean J Parasitol 2010; 48: 219-224. https://doi.org/10.3347/kjp.2010.48.3.219

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