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Estimating the Threshold Effects of Climate on Dengue: A Case Study of Taiwan

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  • Bao-Linh Tran

    (Department of Applied Economics, National Chung Hsing University, Taichung 402, Taiwan)

  • Wei-Chun Tseng

    (Department of Applied Economics, National Chung Hsing University, Taichung 402, Taiwan)

  • Chi-Chung Chen

    (Department of Applied Economics, National Chung Hsing University, Taichung 402, Taiwan)

  • Shu-Yi Liao

    (Department of Applied Economics, National Chung Hsing University, Taichung 402, Taiwan)

Abstract

Climate change is regarded as one of the major factors enhancing the transmission intensity of dengue fever. In this study, we estimated the threshold effects of temperature on Aedes mosquito larval index as an early warning tool for dengue prevention. We also investigated the relationship between dengue vector index and dengue epidemics in Taiwan using weekly panel data for 17 counties from January 2012 to May 2019. To achieve our goals, we first applied the panel threshold regression technique to test for threshold effects and determine critical temperature values. Data were then further decomposed into different sets corresponding to different temperature regimes. Finally, negative binomial regression models were applied to assess the non-linear relationship between meteorological factors and Breteau index (BI). At the national level, we found that a 1°C temperature increase caused the expected value of BI to increase by 0.09 units when the temperature is less than 27.21 °C, and by 0.26 units when the temperature is greater than 27.21 °C. At the regional level, the dengue vector index was more sensitive to temperature changes because double threshold effects were found in the southern Taiwan model. For southern Taiwan, as the temperature increased by 1°C, the expected value of BI increased by 0.29, 0.63, and 1.49 units when the average temperature was less than 27.27 °C, between 27.27 and 30.17 °C, and higher than 30.17 °C, respectively. In addition, the effects of precipitation and relative humidity on BI became stronger when the average temperature exceeded the thresholds. Regarding the impacts of climate change on BI, our results showed that the potential effects on BI range from 3.5 to 54.42% under alternative temperature scenarios. By combining threshold regression techniques with count data regression models, this study provides evidence of threshold effects between climate factors and the dengue vector index. The proposed threshold of temperature could be incorporated into the implementation of public health measures and risk prediction to prevent and control dengue fever in the future.

Suggested Citation

  • Bao-Linh Tran & Wei-Chun Tseng & Chi-Chung Chen & Shu-Yi Liao, 2020. "Estimating the Threshold Effects of Climate on Dengue: A Case Study of Taiwan," IJERPH, MDPI, vol. 17(4), pages 1-17, February.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:4:p:1392-:d:323574
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    5. Wei-Chun Tseng & Chi-Chung Chen & Ching-Cheng Chang & Yu-Hsien Chu, 2009. "Estimating the economic impacts of climate change on infectious diseases: a case study on dengue fever in Taiwan," Climatic Change, Springer, vol. 92(1), pages 123-140, January.
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