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. 2013 Jun;88(6):1070-8.
doi: 10.4269/ajtmh.12-0623. Epub 2013 Mar 4.

Risk factors for the presence of Aedes aegypti and Aedes albopictus in domestic water-holding containers in areas impacted by the Nam Theun 2 hydroelectric project, Laos

Alexandra Hiscox  1 , Angela Kaye, Khamsing Vongphayloth, Ian Banks, Michele Piffer, Phasouk Khammanithong, Pany Sananikhom, Surinder Kaul, Nigel Hill, Steven W Lindsay, Paul T Brey
Affiliations

Risk factors for the presence of Aedes aegypti and Aedes albopictus in domestic water-holding containers in areas impacted by the Nam Theun 2 hydroelectric project, Laos

Alexandra Hiscox et al. Am J Trop Med Hyg. 2013 Jun.

Abstract

We assessed risk factors for vectors of dengue and chikungunya viruses near a new hydroelectric project, Nam Theun 2, in Laos. Immature stages of Aedes aegypti were found only in sites within 40 km of the urban provincial capital, but Aedes albopictus was found throughout. Aedes aegypti pupae were most common in water storage jars (odds ratio [OR] = 4.72) and tires (OR = 2.99), and Ae. albopictus pupae were associated with tires in 2009 (OR = 10.87) and drums, tires, and jars in 2010 (drums OR = 3.05; tires OR = 3.45, jars OR = 6.59). Compared with water storage vessels, containers used for hygiene, cooking, and drinking were 80% less likely to harbor Ae. albopictus pupae in 2010 (OR = 0.20), and discarded waste was associated with a 3.64 increased odds of infestation. Vector control efforts should focus on source reduction of water storage containers, particularly concrete jars and tires.

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Figures

Figure 1.
Figure 1.
Locations of settlements in Laos in which surveys for dengue virus and chikungunya virus vectors were conducted during 2009 and 2010. Settlements located in the NT2 resettlement area are enclosed in the orange circle and settlements outside this area are downstream villages. The urban center, Thakhek Neua, is enclosed by a blue circle. Locations of settlements in which Aedes aegypti was sampled are indicated by squares and locations in which only Ae. albopictus was present are indicated by circular icons.
Figure 2.
Figure 2.
Over-dispersed abundance of Aedes aegypti and Ae. albopictus larvae (upper) and pupae (lower) among houses in Laos during 2009 and 2010. Distribution between houses remained fairly consistent between years.
See this image and copyright information in PMC

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