Dengue fever cases have surged in Hawaii, prompting health authorities to issue urgent warnings for returning travelers about the mosquito-borne virus. The state has reported its 12th case of the year, with the latest infection confirmed on the island of Maui, and the remaining 11 cases occurring on Oahu. Health officials have emphasized that while dengue is not endemic to Hawaii, the recent surge in cases has raised concerns about the potential for local transmission, particularly as the state is a popular tourist destination.
The Hawaii Department of Health (DOH) has advised travelers returning from dengue-endemic regions to take proactive measures to prevent mosquito bites. These precautions are crucial in curbing the spread of the virus, as dengue is transmitted through the bite of an infected Aedes mosquito. The DOH has urged travelers to maintain vigilance and seek medical evaluation if they develop symptoms within two weeks of their return. Additionally, the agency has recommended removing standing water where mosquitoes breed, such as in buckets, planters, and containers, to reduce the risk of breeding sites.
Dengue fever is a significant public health concern globally, with outbreaks reported in numerous countries, including Mexico, Fiji, French Polynesia, Tonga, Samoa, the Philippines, Colombia, Brazil, and Puerto Rico. According to CDC data, there were 1,984 dengue cases in the U.S. in 2024. While the virus is not naturally present in Hawaii, the presence of invasive tiger mosquitoes has been linked to the spread of dengue, as highlighted in recent reports. These invasive species are believed to play a critical role in the current outbreak.
Dr. Mark Fischer, regional medical director of International SOS, has provided guidance on preventing mosquito bites and minimizing the risk of infection. He has advised travelers and residents to use EPA-registered insect repellent containing DEET, picaridin, or lemon and eucalyptus oil. Fischer also recommended wearing long-sleeved clothing, especially during peak mosquito hours of dawn and dusk, and using mosquito nets when sleeping in areas with high mosquito populations. The importance of maintaining window and door screens to prevent insect entry has also been emphasized as a key preventive measure.
Health authorities are urging the public to remain vigilant and take preventive actions to mitigate the spread of dengue. With dengue fever being a growing concern in many regions, including popular U.S. destinations, the health department’s warnings for travelers returning from dengue-endemic areas are a critical step in preventing further outbreaks. As the situation continues to evolve, ongoing monitoring and community efforts will be essential in managing the risk posed by the mosquito-borne virus.