The risk and related factors of dengue outbreak
| Autor: | Yi-Sheng Yang, 楊益昇 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 The purposes of this study were to analyze the risk and evaluate the influence of climate factors on the epidemics of dengue disease in Pingtung city, Taiwan. Initially, both dengue vector mosquitoes, i.e. Aedes aegypti (L.) and Aedes albopictus (Skuse), were reared in laboratory under 10, 13 and 15℃ conditions to illustrate the impact of low temperatures on the development of dengue vectors. The ovitraps were used to monitor the population and dynamics of Aedes mosquitoes in the densely residents areas of Pingtung. The dengue epidemic frequencies and risks, then, were evaluated through analysis of the relationships among various climate factors, changes of vector densities and dengue cases occurred in Pingtung city at 2002 and 2004. The Ae. aegypti can only survival at 15℃ in 3 tested low temperatures, and the mean duration of egg, l st to 4th instar larva and pupa were 27.1±29.2, 3.9±1.1, 2.4±1.0, 2.8±1.1, 6.8±4.2 and 4.7±0.5 days, respectively. The mean cumulative duration of immature stages was 46.3±30.9 days and mortality is 33% during this period. There was only 1 female adult of Ae. albopictus eclosion out of 100 eggs tested at 13℃. The immature stage of this one was as long as 141 days. The developing times needed for egg, 1st to 4th instar larva and pupa of Ae. albopictus in 15℃ were 42.1±44.2, 5.3±2.4, 3.6±2.6, 4.4±5.4, 7.5±5.1 and 4.6±0.8 days, respectively. The mean duration of immature stage was 64.9±22.8 days and cumulative mortality was 55%. There were two population peaks of Aedes vectors found at 22-25 Jun and 27-29 Sep, with 15.4 and 19.7 of mean eggs collected per trap, respectively, during the field ovitrap surveillances at Pingtung city in 2007. The proportion of positive ovitrap (r=0.79, p |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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