Karki Surendra, Hamer Gabriel L, Anderson Tavis K, Goldberg Tony L, Kitron Uriel D, Krebs Bethany L, Walker Edward D, Ruiz Marilyn O
Department of Pathobiology, University of Illinois, Urbana-Champaign, IL, USA.
Department of Entomology, Texas A&M University, College Station, TX, USA.
Environ Health Insights. 2016 Jun 22;10:93-103. doi: 10.4137/EHI.S33384. eCollection 2016.
The local abundance of Culex mosquitoes is a central factor adding to the risk of West Nile virus transmission, and vector abundance data influence public health decisions. This study evaluated differences in abundance estimates from mosquitoes trapped using two common methods: CO2-baited CDC light traps and infusion-baited gravid traps in suburban, Chicago, Illinois. On a weekly basis, the two methods were modestly correlated (r = 0.219) across 71 weeks over 4 years. Lagged weather conditions of up to four weeks were associated with the number of mosquitoes collected in light and gravid traps. Collections in light traps were higher with higher temperature in the same week, higher precipitation one, two, and four weeks before the week of trapping, and lower maximum average wind speed. Collections in gravid traps were higher with higher temperature in the same week and one week earlier, lower temperature four weeks earlier, and with higher precipitation two and four weeks earlier. Culex abundance estimates from light traps were significantly higher in semi-natural areas compared to residential areas, but abundance estimates from gravid traps did not vary by the landscape type. These results highlight the importance of the surveillance methods used in the assessment of local Culex abundance estimates. Measures of risk of exposure to West Nile virus should assess carefully how mosquito abundance has been estimated and integrated into assessments of transmission risk.
库蚊的本地丰度是增加西尼罗河病毒传播风险的一个核心因素，病媒丰度数据会影响公共卫生决策。本研究评估了使用两种常见方法诱捕的蚊子丰度估计值的差异：在伊利诺伊州芝加哥郊区，使用二氧化碳诱饵的疾控中心诱蚊灯和输注诱饵的孕蚊诱捕器。在4年的71周时间里，这两种方法每周的相关性适中（r = 0.219）。长达四周的滞后天气状况与诱蚊灯和孕蚊诱捕器捕获的蚊子数量有关。诱蚊灯捕获的蚊子数量在诱捕当周温度较高、诱捕前一周、两周和四周降水较多以及最大平均风速较低时较多。孕蚊诱捕器捕获的蚊子数量在当周和前一周温度较高、四周前温度较低以及两周和四周前降水较多时较多。与居民区相比，半自然区域诱蚊灯捕获的库蚊丰度估计值显著更高，但孕蚊诱捕器的丰度估计值不会因景观类型而有所不同。这些结果凸显了用于评估当地库蚊丰度估计值的监测方法的重要性。接触西尼罗河病毒的风险评估应仔细考量蚊子丰度是如何估计的以及如何纳入传播风险评估之中。
