1921
Volume 72, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

From September 2000 to June 2003, a community-based program for dengue control using local predacious copepods of the genus was conducted in three rural communes in the central Vietnam provinces of Quang Nam, Quang Ngai, and Khanh Hoa. Post-project, three subsequent entomologic surveys were conducted until March 2004. The number of households and residents in the communes were 5,913 and 27,167, respectively, and dengue notification rates for these communes from 1996 were as high as 2,418.5 per 100,000 persons. Following knowledge, attitude, and practice evaluations, surveys of water storage containers indicated that spp. already occurred in 3–17% and that large tanks up to 2,000 liters, 130–300-liter jars, wells, and some 220-liter metal drums were the most productive habitats for With technical support, the programs were driven by communal management committees, health collaborators, schoolteachers, and pupils. From quantitative estimates of the standing crop of third and fourth instars from 100 households, were reduced by approximately 90% by year 1, 92.3–98.6% by year 2, and immature forms had been eliminated from two of three communes by June 2003. Similarly, from resting adult collections from 100 households, densities were reduced to 0–1 per commune. By March 2004, two communes with no larvae had small numbers but the third was negative; one adult was collected in each of two communes while one became negative. Absolute estimates of third and fourth instars at the three intervention communes and one left untreated had significant correlations ( = 0.009−< 0.001) with numbers of adults aspirated from inside houses on each of 15 survey periods. By year 1, the incidence of dengue disease in the treated communes was reduced by 76.7% compared with non-intervention communes within the same districts, and no dengue was evident in 2002 and 2003, compared with 112.8 and 14.4 cases per 100,000 at district level. Since we had similar success in northern Vietnam from 1998 to 2000, this study demonstrates that this control model is broadly acceptable and achievable at community level but vigilance is required post-project to prevent reinfestation.

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2017-11-21
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References

  1. Nam VS, Yen NT, Holynska M, Reid JW, Kay BH, 2000. National progress in dengue vector control in Vietnam; survey for Mesocyclops (Copepoda), Micronecta (Corixidae) and fish as biological control agents. Am J Trop Med Hyg 62 : 5–10.
  2. Kay BH, Nam VS, Yen NT, Tien TV, Holynska M, 2001. Successful dengue vector control in Vietnam: a model for regional consideration. Arbovirus Res Aust 8 : 187–193.
  3. Brown MD, Kay BH, Greenwood JG, 1991. The predation efficiency of north-eastern Australian Mesocyclops (Copepoda: Cyclopoida) on mosquito larvae. Bull Jpn Plankton Soc Special Volume: 329–338.
  4. Marten GG, Bordes ES, Nguyen M, 1994. Use of cyclopoid copepods for mosquito control. Hydrobiologia 292/293 : 491–496.
  5. Williamson CE, 1991. Copepoda. Thorp JH, Covich AP, eds. Ecology and Classification of North American Freshwater Invertebrates. New York: Academic Press, 787–822.
  6. Nam VS, Yen NT, Kay BH, Marten GG, Reid JW, 1998. Eradication of Aedes aegypti from a village in Vietnam using copepods and community participation. Am J Trop Med Hyg 59 : 657–660.
  7. Kay BH, Nam VS, Tien TV, Yen NT, Phong TV, Diep VTB, Ninh TU, Bektas A, Aaskov JG, 2002. Control of Aedes vectors of dengue in three provinces of Vietnam by use of Mesocyclops (Copepoda) and community-based methods validated by entomologic, clinical, and serologic surveillance. Am J Trop Med Hyg 66 : 40–48.
  8. Gubler DJ, 1989. Aedes aegypti and Aedes aegypti-borne disease control in the 1990s: Top-down or bottom-up. Am J Trop Med Hyg 40 : 571–578.
  9. Tun-Lin W, Kay BH, Barnes A, 1995. Understanding productivity, a key to Aedes aegypti surveillance. Am J Trop Med Hyg 53 : 595–601.
  10. Torres-Estrada JL, Rodriguez MH, Cruz-Lopez L, Arredondo-Jimenez JL, 2001. Selective oviposition by Aedes aegypti (Diptera: Culicidae) in response to Mesocyclops longisetus (Copepoda: Cyclopoidea) under laboratory and field conditions. J Med Entomol 38 : 188–192.
  11. Focks DA, 2003. A review of entomological sampling methods and indicators for dengue vectors. WHO/TDR/IDE/Den/03.1, 1–36. http://www.who.int/tdr/publications/pdf/dengue_vectors.pdf.
  12. Tun-Lin W, Kay BH, Burkot TR, 1994. Quantitative sampling of immature Aedes aegypti in metal drums using sweep net and dipping methods. J Am Mosq Control Assoc 10 : 90–396.
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  • Received : 26 May 2004
  • Accepted : 08 Jul 2004

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