Comparison of the effectiveness of traditional and modified ovitraps for detecting Aedes albopictus oviposition in Hong Kong

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Comparison of the effectiveness of traditional and modified ovitraps for detecting Aedes albopictus oviposition in Hong Kong

 

Author: So, Pak-wing
Title: Comparison of the effectiveness of traditional and modified ovitraps for detecting Aedes albopictus oviposition in Hong Kong
Degree: M.Sc.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Aedes albopictus -- Control -- China -- Hong Kong
Dengue -- China -- Hong Kong -- Prevention
Department: Faculty of Health and Social Sciences
Pages: xii, 73 p. : col. ill. ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2356836
URI: http://theses.lib.polyu.edu.hk/handle/200/5685
Abstract: With the urges for tackling dengue infection, ovitrap becomes an integral part of dengue transmission control and prevention. This study, based on the oviposition behavior of Aedes albopictus, aimed to investigate the effectiveness and feasibility of employing modified ovitrap technique in Hong Kong. The currently occupied CDC ovitrap technique, known as traditional ovitrap technique, was acted as a control to compare with the modified ovitrap technique. The effectiveness of the ovitraps was defined as the number of eggs collected from the ovitrap. This study lasted for nine months, started from the second week of June in 2009 until the fourth week of February in 2010, intended to achieve an overall oviposition pattern of Aedes albopictus throughout the rainy and dry seasons in Hong Kong. 50 pairs of ovitraps were allocated and collected once per month. Two experimental locations, To Kwa Wan and Sai Kung, representing well-urbanized area and non-urbanized area respectively, were selected for placing ovitrap-pair to collect eggs reproduced by Aedes albopictus. Fifty pairs of ovitraps were allocated to both of the two experimental locations once each month. Results showed that modified ovitraps collected greater quantity of Aedes albopictus eggs than traditional ovitraps. There was a statistically significant difference (Sig.<0.05) between the numbers of eggs (M=3.01, S.D.=9.593, N=885) collected by modified ovitrap and the numbers of eggs collected by traditional ovitrap (M=0.78, S.D.=2.374, N=885). This result demonstrated that the effectiveness of the modified ovitraps was greater than that of traditional ovitraps. Apart from comparing the effectiveness between the two ovitrap techniques, another aim of the study was to estimate the correlation between the quantity of mean eggs retrieved and positivity in order to evaluate the feasibility of employing the newly proposed ovitrap technique in Hong Kong. A strong correlation (r=0.983, Sig.<0.05) was observed between the mean numbers of eggs (M=3.05, S.D.=3.993, N=18) and the proportion of positive ovitraps (M=12.45, S.D.=12.083, N=18). These observations suggested that the effectiveness of the modified ovitrap technique was greater than that of the currently utilized traditional ovitrap technique and the feasibility of using the modified ovitrap technique to replace the traditional ovitrap technique was confirmed. As the importance of combating dengue is more and more urged worldwide and dengue control is entirely count on vector control, vector surveillance becomes the key for vector control. The modified ovitrap technique was strongly recommended as a simple, effective, sensitive, fast, environmental friendly, inexpensive and easy to acquire dengue vector surveillance device to replace the currently used traditional ovitrap technique. The green concept for utilizing the modified ovitraps would be highly appreciated in the coming sustainable development century.

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