# Dengue virus cases and detection in Hawaii

> Live situation record from CLSTR: https://clstr.news/situations/dengue-virus-cases-and-detection-in-hawaii
> Updated: 2026-09-03T10:05:00.000Z. Sources: 3. Developments: 2.

In 2026, the Hawaii Department of Health reported seven travel-related dengue virus cases across Oahu, Maui, and Kauai. Officials noted that all cases were linked to international travel and that no connection had been identified between the infections.

Following these reports, the dengue virus was detected in a wastewater sample from the Hilo wastewater treatment plant in Hawaii County on August 24. While the presence of viral genetic material in wastewater serves as an early indicator, health officials stated it does not necessarily confirm active community transmission or clinical cases. As of the detection, no active dengue cases were being tracked in Hawaii County. 

Health officials have emphasized mosquito-control measures, such as eliminating standing water, due to the presence of virus-carrying mosquitoes and recent weather conditions like flooding from Tropical Cyclone Lala.

## Timeline

### 2026-09-03: Dengue virus detected in Hawaii County wastewater

The Hawaii Department of Health detected dengue virus in a wastewater sample from Hilo, though no active clinical cases are currently being tracked in Hawaii County.

3 sources. https://clstr.news/cluster/dengue-virus-detected-in-hawaii-county-wastewater

### 2026-08-19: Hawaii Department of Health confirms seventh dengue case on Oahu

Hawaii health officials confirmed a seventh travel-related dengue case on Oahu this year, prompting mosquito-control measures and public warnings to eliminate standing water.

2 sources. https://clstr.news/cluster/hawaii-department-of-health-confirms-seventh-dengue-case-on-oahu

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Cite as: Dengue virus cases and detection in Hawaii. CLSTR, https://clstr.news/situations/dengue-virus-cases-and-detection-in-hawaii