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<p>Globally, multiple trials have successfully demonstrated the effectiveness of novel tools, such as the sterile and incompatible insect techniques, in suppressing <i>Aedes aegypti</i> populations. However, there is concern that <i>Aedes albopictus</i>, another arbovirus-competent vector, may occupy the niches vacated by <i>Ae. aegypti</i> in areas where these species occur in sympatry. Here we investigate these concerns within the context of a <i>Wolbachi</i>a-based <i>Ae. aegypti</i> suppression programme in highly urban Singapore, where general mosquito management is sustained through environmental management. Using nationally representative and longitudinal <i>Aedes</i> surveillance data, we show (1) no consistent association of increase in <i>Ae. albopictus</i> abundance with <i>Ae. aegypti</i> population suppression within <i>Wolbachia</i>-<i>Aedes</i> release sites, and (2) no significant change in the vertical spatial distribution of <i>Ae. albopictus</i> in high-rise residential apartment blocks even after two years of <i>Ae. aegypti</i> suppression. Finally, we report that dengue viruses were less prevalent in field <i>Ae. albopictus</i> than in <i>Ae. aegypti</i>, which is consistent with previous findings that <i>Ae. albopictus</i> is a lesser vector than <i>Ae. aegypti</i> in Singapore. Together, these results indicate that suppression of <i>Ae. aegypti</i> in the community may not be directly associated with any increase of <i>Ae. albopictus</i> population or capacity. Nonetheless, the risk of increase in <i>Ae. albopictus</i> population is anticipated if the reduction in disease transmission leads to less aggressive source reduction efforts and environmental management for mosquito control.</p>

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Suppression of Aedes aegypti may not affect sympatric Aedes albopictus populations: findings from two years of entomological surveillance in Singapore

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月17日

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  • Wei Jian Wong,
  • Cheong Huat Tan,
  • Matthew Gregory Verkaik,
  • Lee Ching Ng,
  • Ary Anthony Hoffmann,
  • Chee-Seng Chong

摘要

Globally, multiple trials have successfully demonstrated the effectiveness of novel tools, such as the sterile and incompatible insect techniques, in suppressing Aedes aegypti populations. However, there is concern that Aedes albopictus, another arbovirus-competent vector, may occupy the niches vacated by Ae. aegypti in areas where these species occur in sympatry. Here we investigate these concerns within the context of a Wolbachia-based Ae. aegypti suppression programme in highly urban Singapore, where general mosquito management is sustained through environmental management. Using nationally representative and longitudinal Aedes surveillance data, we show (1) no consistent association of increase in Ae. albopictus abundance with Ae. aegypti population suppression within Wolbachia-Aedes release sites, and (2) no significant change in the vertical spatial distribution of Ae. albopictus in high-rise residential apartment blocks even after two years of Ae. aegypti suppression. Finally, we report that dengue viruses were less prevalent in field Ae. albopictus than in Ae. aegypti, which is consistent with previous findings that Ae. albopictus is a lesser vector than Ae. aegypti in Singapore. Together, these results indicate that suppression of Ae. aegypti in the community may not be directly associated with any increase of Ae. albopictus population or capacity. Nonetheless, the risk of increase in Ae. albopictus population is anticipated if the reduction in disease transmission leads to less aggressive source reduction efforts and environmental management for mosquito control.