The Hawai‘i Department of Health (DOH) confirmed a travel-related dengue virus case in the Hale‘iwa area on O‘ahu. Upon investigation, DOH found conditions that could increase the risk of transmission. The public is urged to take additional precautions to protect themselves from mosquito bites and to stop mosquitoes from breeding.

Highly dense populations of Aedes albopictus mosquito, a vector of dengue virus, were identified around the residence where the case was found and the surrounding area. Initial vector control response resulted in a marked reduction of mosquitoes around the case residence. DOH will continue to monitor mosquito numbers in this area and take additional measures as needed. Signage will be posted to educate the public on how to protect themselves and prevent transmission.

To reduce potential transmission of dengue, DOH is requesting the public to adhere to the following precautionary measures:

• Apply mosquito repellent on exposed skin, especially if outdoors. Repellent should be registered with the Environmental Protection Agency (EPA) and contain 20-30% DEET (active ingredient). Other alternative active ingredients may include picaridin, oil of lemon eucalyptus, or IR3535. To find the insect repellent that is right for you, visit the EPA’s website at https://www.epa.gov/insect-repellents/find-insect-repellent-right-you.
• Wear loose-fitting clothes (long sleeve and pants) that covers your skin.
• Keep mosquitoes out of your home/business by keeping doors closed or screens in good repair.
• Eliminate potential breeding sites by dumping out any standing water in or around your residence or business. This includes getting rid of rainwater collected in buckets, flower pots, used tires, or even plants such as bromeliads.

Symptoms of dengue typically may be mild or severe and include fever, nausea, vomiting, rash, and body aches. Symptoms typically last two to seven days and although severe and even life-threatening illness can occur, most people could recover after about a week. Anyone experiencing any of the symptoms listed above should see a doctor or heath care provider and inform them that they were in an area where a case of dengue virus was confirmed.

Dengue virus is spread from infected person to person through the mosquito bites. While Hawai‘i is home to the type of mosquitos that can carry dengue, the disease is not established here in the state. Of the 10 dengue cases reported in Hawai‘i since January 1, 2023 to present, five had traveled to Central or South America and five had traveled to Asia.

Anyone who travels to an area with dengue is at risk for infection. Currently, the CDC advises travelers to practice usual precautions when traveling to areas of dengue risk. Travelers returning from an area with risk of dengue should take steps to prevent mosquito bites for three weeks. If symptoms of dengue develop within two weeks upon return, seek medical evaluation.

For more information, visit the Disease Outbreak Control Division (DOCD) website and Vector Control Branch (VCB) website.