The Hawai‘i Department of Health (DOH) has reported a new travel-related case of dengue virus on Maui. This brings the total number of dengue cases in the state to four for 2025, with one case on Maui and three on Oʻahu. The individual involved contracted the virus while traveling in an area where dengue is prevalent.
In response, DOH teams have been dispatched to inspect and implement mosquito control measures in the affected region. The public is urged to adhere to recommended practices to prevent local transmission.
"Dengue virus is transmitted from an infected person to a mosquito, and then to another person," explained health officials. Although mosquitoes capable of carrying dengue are present in Hawai‘i, the disease is not endemic there; current cases are linked to travelers. Increased dengue activity has been observed globally.
Dengue outbreaks are common in regions such as Central and South America, Asia (including the Republic of the Philippines), the Middle East, Africa, and various Pacific Islands including U.S. territories like American Samoa and others. Tourist destinations in the Caribbean, such as Puerto Rico, also face dengue risks.
Last year saw 16 travel-related dengue cases reported in Hawaiʻi. Travelers had visited countries like Brazil, Argentina, Costa Rica, El Salvador, Guatemala, Mexico, Puerto Rico, Honduras, Indonesia, Thailand, Japan, Philippines and India before symptom onset.
Travelers planning trips to areas with dengue risk should take precautions as advised by the Centers for Disease Control and Prevention (CDC). These include using EPA-registered insect repellent, wearing protective clothing outdoors, and ensuring sleeping areas are secure from mosquitoes. With some countries experiencing heightened dengue activity this year, travelers should consult updated travel information well ahead of their journeys.
Upon returning from dengue-endemic regions, travelers should avoid mosquito bites for three weeks. If symptoms develop within two weeks post-return—such as fever or rash—medical evaluation is recommended.
Dengue symptoms can vary from mild to severe but generally resolve within a week. Severe illness is possible but rare. Those who have traveled recently and experience symptoms should contact healthcare providers promptly.
In locations with confirmed or suspected cases of dengue, DOH's Vector Control Branch personnel are conducting inspections and activities aimed at reducing mosquito populations. Reducing these populations helps lower transmission risk. For areas without reported cases yet aiming for prevention, eliminating potential breeding sites around homes can be effective.
Mosquitoes require only minimal standing water for breeding purposes. Common sites include buckets, certain plants like bromeliads that collect water easily small containers or planters rain barrels even discarded cups left outside emptying these can significantly decrease breeding potential.