在20世纪80年代现代杀虫剂几乎将富裕国家的臭虫彻底消灭后，这一害虫自90年代末在澳大利亚、欧洲、北美和亚洲部分地区卷土重来。长期以来的主流理论认为，国际航空旅行的激增导致在全球不同地区幸存的耐药臭虫频繁跨国交流与基因杂交，从而催生了具备泛耐药性的“全球超级害虫”。然而，由于此前全基因组测序成本高昂且技术复杂，这一关于全球化传播驱动超级臭虫进化的假说多年来始终未得到严格的实证检验。

为验证该假说，弗吉尼亚理工学院昆虫学家沃伦·布思（Warren Booth）团队在发表于本月《害虫科学杂志》（Journal of Pest Science）的研究中，对2009年12月至2011年1月期间采集自美国、加拿大和欧洲109个种群的971只臭虫进行了基因测序。出乎意料的是，样本并未表现出趋同的耐药基因混合，而是呈现出鲜明的地域遗传特征：美国臭虫普遍携带能强力抵抗拟除虫菊酯类杀虫剂的双重基因突变，而该突变在加拿大和欧洲几乎完全不存在；与此同时，欧洲种群中发现的另一种效力较弱的突变在其他地区也未见踪迹。

这一基因差异有力驳斥了跨大西洋航班扩散耐药超级基因的猜想。布思博士指出，历史上的杀虫剂灭杀虽然大幅削减了臭虫数量，但未能彻底根除的残留群体在数十年间形成了相互隔绝的“孤岛”种群；在达尔文式的岛屿隔离机制下，各本地幸存群体在局部环境中独立演化出了针对特定杀虫剂的抗性机制。90年代末肆虐欧美酒店与民居的臭虫并非由国际旅客输入的“外来入侵物种”，而是本土长期潜伏、各自独立完成抗药进化的本土演变产物。

Following the dramatic collapse of bed-bug populations in developed countries by the 1980s due to synthetic insecticides, infestations staged a sudden international resurgence during the late 1990s across North America, Europe, Australia, and Asia. Entomologists widely theorised that burgeoning commercial aviation was transporting surviving insects across borders, facilitating interbreeding between regionally distinct pesticide-resistant populations and spawning a globally mixed super-pest. However, because molecular testing was complex and cost-prohibitive throughout the 1990s, this pervasive transmission hypothesis remained untested empirically for decades.

To rigorously evaluate the cross-border hybridisation theory, a research team led by entomologist Warren Booth of Virginia Tech analysed the genomic profiles of 971 individual bed bugs sampled between December 2009 and January 2011 from 109 distinct populations across America, Canada, and Europe. Reporting in the Journal of Pest Science, the researchers discovered stark geographic divergence rather than a uniform global gene pool. American bed bugs predominantly possessed a double mutation conferring robust resistance to pyrethroid insecticides that was virtually absent in Canadian and European specimens, while an alternative, weaker mutation found in Europe was entirely absent elsewhere.

These mutually exclusive genetic signatures demonstrate that transatlantic travel did not disperse a single imported super-strain into international bedrooms. Instead, intense historical pesticide use drastically suppressed populations into isolated pockets akin to Darwinian island habitats, completely disconnected from one another for decades. Under extreme reproductive isolation, surviving local colonies independently evolved specialised resistance mutations before rebounding in situ. Consequently, the catastrophic resurgence documented at the turn of the century stemmed not from foreign invasive super-bugs, but from locally incubated, home-grown populations adapting to chemical pressures.

Source: Should you fear pesticide-resistant super-bed bugs?

Subtitle: Thankfully not. But individual populations are getting harder to eliminate

Dateline: Sep 24th 2026\n