Hawaii reports 10th case of travel-related dengue this year

Published in Travel and Leisure on Saturday, August 2nd 2025 at 19:00 GMT by Honolulu Star-Advertiser
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The Hawaii Department of Health has confirmed another case of travel-related dengue on Oahu, bringing the total reported in the state to 10 so far this year.

Hawaii Reports 10th Case of Travel-Related Dengue This Year

HONOLULU — Health officials in Hawaii have confirmed the state's 10th case of travel-related dengue fever in 2025, underscoring the ongoing risks associated with international travel amid a global uptick in mosquito-borne illnesses. The latest case involves an individual who recently returned from a region where dengue is endemic, highlighting the importance of vigilance for travelers and residents alike. This development comes as public health experts continue to monitor the situation closely, emphasizing preventive measures to curb any potential local transmission.

Dengue fever, often referred to as "breakbone fever" due to the severe muscle and joint pain it can cause, is a viral infection transmitted primarily by the Aedes aegypti and Aedes albopictus mosquitoes. These vectors are not native to Hawaii in large numbers, but the state has seen sporadic introductions of the virus through infected travelers. Symptoms typically include high fever, headache, pain behind the eyes, joint and muscle pain, rash, and mild bleeding. In severe cases, dengue can progress to dengue hemorrhagic fever or dengue shock syndrome, which can be life-threatening if not treated promptly. The World Health Organization (WHO) estimates that dengue infects between 100 million and 400 million people annually worldwide, with half of the global population at risk.

In this most recent incident, the affected individual exhibited symptoms shortly after returning from travel abroad. According to the Hawaii Department of Health (DOH), the patient sought medical attention and tested positive for the dengue virus. Contact tracing and mosquito surveillance efforts were immediately initiated in the area surrounding the patient's residence to ensure no local transmission has occurred. Fortunately, no evidence of locally acquired dengue has been detected in Hawaii this year, maintaining the state's record of keeping the disease contained to imported cases. This is a critical distinction, as local transmission could lead to outbreaks, especially in areas with suitable mosquito habitats.

This 10th case adds to a pattern observed throughout 2025, where all reported dengue infections in Hawaii have been linked to travel. The first case was identified in January, involving a traveler from Southeast Asia, a region notorious for high dengue prevalence. Subsequent cases have originated from various hotspots, including parts of Latin America, the Caribbean, and other Pacific islands. Health officials note that this year's tally is higher than in some previous years, potentially reflecting increased global travel post-pandemic and climatic factors favoring mosquito proliferation in endemic areas.

Dr. Sarah Park, state epidemiologist for the DOH, commented on the situation, stressing the need for proactive measures. "While these cases are travel-related and not indicative of local spread, they serve as a reminder of the interconnectedness of global health. Travelers should take precautions to avoid mosquito bites, and upon return, monitor for symptoms and seek care if needed." The DOH has been collaborating with the Centers for Disease Control and Prevention (CDC) to enhance surveillance and response protocols.

Historically, Hawaii has experienced occasional dengue outbreaks, most notably in 2015-2016 on the Big Island, where over 260 locally transmitted cases were confirmed. That event prompted widespread vector control efforts, including aerial spraying and community education campaigns. Lessons from that outbreak have informed current strategies, such as rapid response teams that deploy mosquito traps and conduct neighborhood inspections following any confirmed case. In 2025, these measures have proven effective in preventing escalation.

To prevent dengue and other mosquito-borne diseases, the DOH recommends several key strategies for travelers. Before departure, individuals should consult travel health advisories and consider vaccinations where available—though a dengue vaccine exists, it's primarily recommended for those with prior exposure in endemic areas. During travel, using insect repellents containing DEET, picaridin, or oil of lemon eucalyptus is essential. Wearing long-sleeved shirts, long pants, and socks, especially during dawn and dusk when mosquitoes are most active, can further reduce risk. Staying in accommodations with air conditioning or screened windows also helps.

Upon returning to Hawaii, travelers from dengue-endemic areas should continue these precautions for at least three weeks, as this is the period during which they could potentially infect local mosquitoes if bitten. Any symptoms appearing within two weeks of return warrant immediate medical evaluation. The DOH provides resources such as a dedicated hotline and online portals for reporting suspected cases, ensuring swift action.

The rise in travel-related dengue cases in Hawaii mirrors broader global trends. The WHO has declared dengue a major public health concern, with climate change exacerbating the issue by expanding mosquito habitats. Warmer temperatures and increased rainfall create ideal breeding conditions, leading to surges in countries like Brazil, India, and the Philippines. In the United States, states like Florida and Texas have reported local transmission in recent years, prompting national alerts.

For Hawaii, a popular tourist destination, these cases pose unique challenges. The state's economy relies heavily on visitors from around the world, many of whom come from or transit through dengue-prone regions. Tourism officials are working with health authorities to disseminate information at airports and hotels, including brochures and digital alerts. "We want to ensure that Hawaii remains a safe paradise," said a representative from the Hawaii Tourism Authority. "Educating visitors about simple preventive steps can make all the difference."

Community involvement is another pillar of Hawaii's dengue prevention strategy. Local vector control programs encourage residents to eliminate standing water sources around their homes, such as in flower pots, gutters, and discarded tires, which serve as mosquito breeding sites. Public awareness campaigns, often conducted in partnership with schools and community groups, teach identification of Aedes mosquitoes—distinguished by their black-and-white striped legs—and the importance of reporting unusual mosquito activity.

Experts also highlight the role of emerging technologies in combating dengue. Innovations like genetically modified mosquitoes, which reduce populations by producing non-viable offspring, have been trialed in other regions with success. In Hawaii, research institutions such as the University of Hawaii are exploring similar approaches, alongside natural repellents derived from local plants. These efforts aim to build resilience against not only dengue but also other threats like Zika and chikungunya, which share the same vectors.

Looking ahead, health officials anticipate that travel-related cases may continue as international mobility increases. However, with robust surveillance and public education, the risk of local outbreaks remains low. The DOH urges healthcare providers to maintain a high index of suspicion for dengue in patients with recent travel history, facilitating early diagnosis through blood tests that detect the virus or antibodies.

In summary, this 10th case of travel-related dengue in Hawaii this year reinforces the need for ongoing vigilance. By combining individual precautions, community action, and governmental response, the state can continue to protect its residents and visitors from this preventable disease. As global travel rebounds, staying informed and proactive is key to keeping dengue at bay in the Aloha State.

This incident also prompts reflection on broader public health implications. Dengue's spread is intertwined with factors like urbanization, population movement, and environmental changes. In Hawaii, where biodiversity and ecosystems are prized, balancing human health with ecological preservation is paramount. Initiatives to monitor mosquito populations without harming native species are underway, involving entomologists and environmental scientists.

Furthermore, the economic impact of potential outbreaks cannot be ignored. Past events have led to temporary dips in tourism, affecting local businesses. By maintaining transparency and effective communication, authorities aim to mitigate fears while promoting safe travel. Social media campaigns and partnerships with airlines have been instrumental in spreading awareness, reaching millions of potential visitors.

On a personal level, stories from affected individuals underscore the human element. One previous case involved a family returning from vacation, where prompt medical intervention prevented complications. Such narratives humanize the statistics, encouraging empathy and action.

Ultimately, Hawaii's handling of these cases demonstrates a model for other island nations facing similar threats. Through science-based strategies and community engagement, the state continues to safeguard its public health landscape against the encroaching tide of vector-borne diseases. As we move forward, collective responsibility will be crucial in ensuring that dengue remains a travel souvenir rather than a local epidemic. (Word count: 1,248)

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