Florida Dengue 2026: Who's at Risk and How Do You Avoid It?
The practical defense against Florida's dengue outbreak is unchanged and effective: a daytime-active repellent on exposed skin, screens on your windows and doors, and no standing water around the house. Most infections stay mild, but a defined minority (older adults, people with diabetes, pregnant women, those who have had dengue before) face sharply higher odds of severe disease. The state is in the middle of the largest continental US dengue outbreak since the 1940s, and no dengue vaccine is available to residents here.
Florida has had locally acquired dengue before, but 2026 stands apart. State surveillance has confirmed 252 locally acquired cases, 223 of them in a single county, Hillsborough, around Tampa Bay, along with one death in an 80-year-old resident.
Why 2026 is the biggest year since the 1940s
Locally transmitted dengue was rare on the mainland US after the 1940s, and Florida's cases only started trickling back in 2009, usually a few dozen cases a year in Florida or Texas. The jump this year is not a mystery. Global dengue hit a record 14.1 million cases in 2024, mostly in Latin America and the Caribbean, and the Florida outbreak sits downstream of that. The state has also logged 245 travel-associated cases in 2026, each one a seed waiting for a local Aedes aegypti to bite the infected traveler and then bite a neighbor. Hillsborough County has extended a local state of emergency into October and ramped up aerial and ground spraying after finding dengue virus in trapped mosquitoes.
Who gets seriously sick
Most dengue infections are quiet. Across community cohorts, roughly half of people who get infected have no symptoms at all, and overall case fatality stays well under 1% when medical care is available. The people who do badly are not random. The risk of severe dengue roughly triples in adults with diabetes and in pregnant women, roughly doubles in people with hypertension, and rises with age in adults. A second lifetime infection with a different serotype of the virus pushes severe-disease risk up two- to threefold, because antibodies from the first infection can paradoxically make the next one worse. Children well above a healthy weight also run higher odds of severe dengue. If you fit one of these descriptions and you develop a sudden fever with headache, body aches, or pain behind the eyes in the next few weeks, see a clinician and get tested for dengue early.
What keeps Aedes aegypti from biting you
Aedes aegypti bites during the day, lives in and around houses, and breeds in anything that holds water for a few days: a plant saucer, a bucket, a bottle cap, a clogged gutter. Controlled trials and household studies converge on a short list of measures that work, and a shorter list that does not.
| Measure | What the evidence shows | Practical takeaway |
|---|---|---|
| Picaridin 20% | Multi-hour protection, with less skin irritation | An equally good choice if you dislike DEET |
| Window and door screens | Associated with roughly 80% lower odds of dengue in household studies | The best fixed-cost measure in your home; install or repair any gaps |
| Dumping standing water weekly | Reduces vector production and household transmission in community trials | Walk the yard; empty saucers, buckets, toys, bottle caps; clear gutters |
| Spatial (plug-in) repellents | Cut arboviral seroconversion by about a third in a cluster-randomized trial | Reasonable to use indoors in addition to repellent and screens |
| Insecticide-treated curtains or coils alone | No reduction in dengue in trials; coils linked to higher infection odds in some studies | Do not rely on these as your main defense |
The vaccine gap, and why it matters now
Two dengue vaccines exist, and neither is going to help you in Florida this year. Sanofi's Dengvaxia is the only one FDA-approved in the US, but it was never meant for Florida: the official recommendation covers only children ages 9 to 16 who live in endemic US areas (Puerto Rico, the US Virgin Islands, American Samoa, and the freely associated Pacific states) and have evidence of a prior dengue infection. Sanofi is discontinuing it, with the last doses expiring around August 2026. Takeda's Qdenga, approved in roughly 40 countries, is not available in the US. Takeda withdrew its FDA application in 2023 after regulators asked for additional data, and nothing has replaced it. In the pivotal phase 3 trial, Qdenga's protection was durable in people who had already had dengue; in dengue-naive recipients it protected against serotypes 1 and 2 but showed no efficacy against serotype 3.
What to do now
If you live in Florida and you are not in a high-risk group, use a daytime repellent when you are outside, make sure your screens close properly, and keep standing water off your property. If you are over 60, pregnant, diabetic, hypertensive, obese, or you have had dengue before, apply the same measures carefully, and if you get an unexplained fever in the next few weeks, get a dengue test early. Three things would change this answer. FDA approval or expanded access for Qdenga in the continental US would give high-risk residents a real medical option. A CDC advisory specific to the Florida outbreak would sharpen clinical testing thresholds. And confirmation that a second dengue serotype has settled into Tampa Bay would push the severe-disease math upward for anyone who was infected the first time around.