# Asian tiger mosquito spread and monitoring

> Live situation record from CLSTR: https://clstr.news/situations/asian-tiger-mosquito-spread-and-monitoring
> Updated: 2026-08-21T02:42:56.000Z. Sources: 2. Developments: 2.

The invasive Asian tiger mosquito, Aedes albopictus, has been identified in multiple global locations. In Guimarães, Portugal, health authorities detected the species and reinforced entomological surveillance to monitor its establishment. While the mosquito is capable of transmitting diseases such as dengue, Zika, and chikungunya, officials noted that no such illnesses have been identified in the community.

Reports of the species have also emerged in other regions. In the Chicago metropolitan area, officials noted a significant rise in activity attributed to hot and humid weather. Meanwhile, in Balzers, Liechtenstein, the first egg of the species was detected in an industrial area. Local authorities in Liechtenstein are utilizing traps and treating potential breeding sites with Bti to target larvae, though they stated there is currently no danger to the public as no relevant pathogens are circulating in the area.

## Timeline

### 2026-08-21: Asian tiger mosquito activity reported in Chicago and Liechtenstein

The Asian tiger mosquito is seeing increased activity in the Chicago area and has been detected in Balzers, Liechtenstein, prompting monitoring and pest control measures.

2 sources. https://clstr.news/cluster/asian-tiger-mosquito-activity-reported-in-chicago-and-liechtenstein

### 2026-08-13: Guimarães detects Asian tiger mosquito capable of transmitting diseases

The Asian tiger mosquito, capable of transmitting dengue, Zika, and chikungunya, has been detected in Guimarães, Portugal. Authorities report no current disease transmission but have increased surveillance.

2 sources. https://clstr.news/cluster/guimares-detects-asian-tiger-mosquito-capable-of-transmitting-diseases

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Cite as: Asian tiger mosquito spread and monitoring. CLSTR, https://clstr.news/situations/asian-tiger-mosquito-spread-and-monitoring