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Florida health officials have tallied more than 250 locally acquired dengue cases this year, with most reported in Hillsborough County, home to Tampa. The outbreak appears to be the largest in a continental U.S. state in decades, although historical data are limited; one Florida death has been reported.
Florida health officials have reported more than 250 locally acquired dengue cases so far this year, with the vast majority in Hillsborough County, home to Tampa. Available state records and medical-journal reports suggest the outbreak may be the largest in a continental U.S. state in decades, though federal officials say historical data are limited.
The Florida Department of Health’s tally was 252 locally acquired cases as of the week described in the report, compared with 245 travel-associated cases. At least 13 Hillsborough County cases were diagnosed in travelers, according to the state. The locally acquired count refers to infections contracted in Florida rather than during travel.
The outbreak has included one reported death: an elderly Tampa woman who died Sept. 4. Hillsborough and surrounding counties have declared local emergencies, while mosquito-control crews in the Tampa area have sprayed and checked properties for standing water where mosquitoes can breed.
Dengue is a virus spread by mosquitoes. Many people who are infected do not become ill, but others develop fever, flu-like symptoms and severe aches. Serious cases can involve bleeding, shock and death. The report says more than 2.2 million infections and nearly 1,200 deaths worldwide have been reported this year, while U.S. data recorded nearly 1,900 locally acquired cases, most in Puerto Rico.
A Record-Scale Local Outbreak
The case count matters because it indicates that dengue is spreading locally at a scale rarely reported in the continental United States. Florida’s previous worst year in the available record was 2023, with just under 200 locally spread cases. The current count is also nearing the 264 locally acquired cases reported in Hawaii over six months in 2015–16, the largest state outbreak reported since the 2009–10 Key West cases.
Local transmission means people can be infected without traveling to a place where dengue is widespread. That raises the importance of mosquito control and bite prevention in affected neighborhoods, while the single reported death underscores that the illness can be severe. The figures do not mean that every infection will lead to serious disease, and they do not establish how long the outbreak will continue.
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How Florida Reached This Point
For decades, most dengue infections identified in the continental United States were associated with international travel; locally acquired cases were also reported in Puerto Rico. In 2009–10, Key West recorded the first locally acquired continental U.S. cases outside the Texas-Mexico border region since 1945, according to the report.
Florida often records the most locally transmitted cases among the 50 states, and its previous annual high came in 2023. The Tampa-area outbreak, first reported in July, is unusual because Florida’s cases are more commonly concentrated around Miami. Tulane University dengue expert Dawn Wesson said travel patterns may be one factor in the Tampa-area surge, but she cautioned that its cause is difficult to determine.
Four dengue virus types circulate. A first infection builds lasting antibodies to that type, but a later infection with another type can carry a risk of more severe disease. The source report says most people in the Tampa area are unlikely to have prior immunity to any dengue type. It also notes that dengue-carrying mosquitoes live in Florida and other warm parts of the United States, and that experts link their expanding range in part to climate change.
““There’s a good chance that this is the new normal,””
— Dawn Wesson, a Tulane University expert on dengue and mosquito-borne diseases
Why Tampa Cases Surged
The reasons for the Tampa-area concentration remain uncertain. Wesson said travel patterns could have contributed, but the report does not establish a single cause. It is also unclear how much the total may rise or how long local transmission will continue.
Historical comparisons carry limits: federal health officials say their dengue outbreak data are limited, and the decades-long ranking relies on available state health department information and medical journals. The current count and the claim that it is the largest in decades should be understood in that context. The report also says the CDC has provided funding but has not sent disease investigators, because state officials have not requested them.
Mosquito Control and Case Tracking
Florida and local officials are continuing mosquito-control work, including spraying and inspections for standing water. Health departments will need to track new locally acquired infections to see whether the outbreak is slowing or spreading further. The report does not give a timetable for when officials expect the outbreak to end or announce a planned CDC field investigation.
People in affected areas can reduce exposure by using EPA-registered repellents, wearing long sleeves and pants, staying behind window screens or in air-conditioned rooms, and removing pooled water from their properties. These steps are especially relevant around sunrise and sunset, when mosquitoes may be more active, though dengue-carrying mosquitoes can bite at other times as well.
Key Questions
How many locally acquired dengue cases has Florida reported?
State officials reported more than 250 cases this year. The report gives a count of 252 locally acquired cases as of the week it covered.
Where is the outbreak concentrated?
The vast majority of cases have been reported in Hillsborough County, which includes Tampa. The outbreak was described as centered just north of Tampa.
Is this the largest dengue outbreak in the continental United States?
Available state records and medical-journal reports suggest it is the largest in a continental U.S. state in decades. Federal officials say their historical outbreak data are limited, so the comparison is not definitive.
How many people have died in Florida’s outbreak?
The report records one death this year: an elderly Tampa woman who died Sept. 4.
What can people in affected areas do to reduce mosquito bites?
The report recommends EPA-registered insect repellent, long sleeves and pants, screened or air-conditioned indoor spaces, and removing standing water where mosquitoes can breed. These are general prevention steps, not a substitute for advice from a qualified health professional.
Source: rss
