过去十年，新墨西哥、犹他等地持续捕获Aedes aegypti，2023年科罗拉多Grand Junction再次捕到2只后，2024年监测首年直接记录796只成蚊与446枚卵，显示该物种已在约70,000人口城市定殖；2025年截至10月中又捕获526只，分布集中在约100英亩的Orchard Mesa区域。全球层面，2000–2024年登革热通报病例增加超过20倍，WHO估计每年100–400百万感染、约一半人类处于风险中，且2025年全球已报告超过2,500例死亡。气候变暖使该蚊种能在更高纬度和更长季节内存活。
该物种在科罗拉多的持续出现源于冬季变暖：Grand Junction在2024年仅出现17天低于冰点，为史上最少，而过去典型值超过两个月；自1970年以来冬季平均升温2.2°F。研究者推测蚊子利用地下室与温室越冬。因该蚊偏好容器繁殖、跳跃式产卵与隐蔽觅食，人为追踪困难，且部分居民并未知其存在。区域控制难度高且昂贵：2025年额外陷阱、加班人力与替代药剂共耗费约15,000美元，同时已发现其对permethrin具抵抗性。
登革热在该州爆发的可能性仍低，因为传播需有感染者被叮咬后再扩散，但州方正密切监测是否扩散至更多县域。Aedes aegypti较晚季节仍活跃，与原生Culex种群秋季衰减形成对比。若无法清除或限制其分布，控制单位担忧其规模扩大将改变防疫格局。
Over the past decade, New Mexico and Utah have repeatedly detected Aedes aegypti, and when Colorado’s Grand Junction captured two more in 2023, a 2024 surveillance launch documented 796 adults and 446 eggs, confirming establishment in the city of roughly 70,000; by mid-2025 an additional 526 adults were collected within an approximately 100-acre zone in Orchard Mesa. Globally, dengue reports rose more than twentyfold from 2000–2024, with WHO estimating 100–400 million infections yearly and about half the world at risk; more than 2,500 dengue deaths have already been recorded in 2025. Warming climates are enabling the mosquito to survive farther north and for longer seasons.
Its persistence in Colorado reflects winter warming: Grand Junction saw only 17 sub-freezing days in 2024, the fewest on record, compared with historically more than two months; winters have warmed 2.2°F since 1970. Researchers suspect overwintering in basements and greenhouses. Because the species breeds in containers, lays eggs across multiple sites, and feeds close to homes, detection is difficult and public awareness remains limited. Control is costly and complex: in 2025 the district spent about $15,000 on new traps, extra staff time, and alternative insecticides after discovering resistance to permethrin.
Dengue outbreak risk in Colorado remains low since local transmission requires an infected traveler to be bitten, but officials monitor for expansion beyond current boundaries. Unlike native Culex, Aedes aegypti remains active later into fall. If eradication or containment fails, officials warn the mosquito could significantly alter regional vector-control dynamics.