Entomological investigations in a focus of dengue transmission in Cairns, Queensland, Australia, by using the sticky ovitraps

Ritchie, Scott A., Long, Sharron, Smith, Greg, Pyke, Alyssa, and Knox, Tessa B. (2004) Entomological investigations in a focus of dengue transmission in Cairns, Queensland, Australia, by using the sticky ovitraps. Journal of Medical Entomology, 41 (1). pp. 1-4.

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Abstract

Sticky ovitraps (patent pending) were used to sample female Aedes aegypti (L.) weekly in a focus of dengue activity in Cairns, Queensland, Australia. In February 2003, transmission of dengue virus serotype 2 began in the suburb of Parramatta Park, peaking in mid-March 2003. This suburb features many older, unscreened houses with high populations of Ae. aegypti. Highest densities (2–3.5 females per trap per week) were obtained during peak dengue transmission (January and February) before mosquito control was initiated. Beginning in late March, female Ae. aegypti collected in sticky ovitraps were tested for dengue viral RNA by using a TaqMan reverse transcription-polymerase chain reaction assay. Dengue viral RNA was detected in six pools of Ae. aegypti collected in late March. The highest minimum infection rate was 116/1000 mosquitoes. After the initiation of larval control (containers treated with S-methoprene or lambda-cyhalothrin) and adult control (interior harborage sites sprayed with lambda-cyhalothrin) in early March, trap collections dropped to <0.5 per trap per week, and no virus was detected in trapped mosquitoes. Human cases subsequently dropped from a high of seven cases per day in mid-March to only sporadic cases in late April, with the final reported onset of 7 May. Sticky ovitraps have potential as a monitoring device for gravid Ae. aegypti and can be used to assess control efficacy and dengue virus activity. A sticky ovitrap index (mean number of female Ae. Aegypti per trap per week) could be useful in gauging the risk of dengue transmission.

Item ID: 6623
Item Type: Article (Refereed Research - C1)
Keywords: Aedes aegypti; Cairns; dengue; sticky ovitrap; surveillance; polymerase chain reaction
ISSN: 0022-2585
Date Deposited: 01 Mar 2010 00:24
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1117 Public Health and Health Services > 111705 Environmental and Occupational Health and Safety @ 80%
11 MEDICAL AND HEALTH SCIENCES > 1117 Public Health and Health Services > 111799 Public Health and Health Services not elsewhere classified @ 20%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920109 Infectious Diseases @ 80%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920404 Disease Distribution and Transmission (incl. Surveillance and Response) @ 20%
Citation Count from Web of Science Web of Science 53
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