How widespread is Florida’s dengue outbreak?

Of the year’s locally acquired cases, 62 were reported during Sept. 20–26. That is the week they entered the report, not necessarily the week every infection occurred. The figures are a snapshot through Sept. 26, not a final total for 2026.

The Florida Department of Health also recorded 20 dengue-positive mosquito pools statewide for the year, including three in Hillsborough County from mosquitoes collected Sept. 22 and 24. Those are mosquito-testing results, not additional human cases. Alongside case reports, they help health officials track where the virus is being detected.

One person has died of dengue in Florida this year, the Associated Press reported, citing confirmation from the state health department. AP also reported that many infected people do not become sick, while severe cases can cause serious complications. The death makes the local outbreak consequential without changing what the state’s figures say about the rest of the country.

Is this the largest dengue outbreak in decades?

AP reported Friday that Florida’s outbreak appears to be the largest state dengue outbreak in the continental United States in decades. That is a qualified historical comparison, not a definitive claim that no larger outbreak has occurred. Federal officials say historical outbreak data are limited, and AP drew on available state reports and medical literature.

Florida’s previous highest year for locally acquired dengue was 2023, when the state recorded just under 200 cases, AP reported. Northeastern University epidemiologist Michael Johansson told TIME, “This is the most locally acquired cases that we've seen in the state”. His assessment describes how unusual Florida’s current tally is; it does not make the provisional count final.

Case counts can miss infections. The CDC says mild illness is more likely to go unreported, while reporting delays can leave federal figures behind state or local tallies. Those limits matter when comparing outbreaks across places and years, as well as when reading Florida’s latest weekly report.

How does dengue spread through mosquitoes?

Dengue usually passes from an infected person to a mosquito that bites them, then to another person bitten by that mosquito. It does not ordinarily spread directly from one person to another. The CDC identifies Aedes aegypti and Aedes albopictus as mosquitoes that can transmit the virus.

These mosquitoes lay eggs in containers that hold water, live near people indoors and outdoors, and may bite during the day or at night. Removing standing water and preventing bites address both places where mosquitoes can breed and opportunities for the virus to move between mosquitoes and people.

Travel can bring dengue into an area without producing a local outbreak. Local transmission becomes a concern when mosquitoes capable of carrying the virus bite an infected person and then bite someone else. That is why Florida tracks travel-associated and locally acquired infections separately, and why the CDC asks health departments to establish where infections were acquired.

The precise reason for Hillsborough County’s high case count is not established. Dengue expert Dawn Wesson told AP that the increase was difficult to explain, though travel patterns could be a factor. The case totals show where transmission has been reported; they do not, on their own, explain why this outbreak grew.

What do the U.S. figures say about risk outside Florida?

AP reported Friday that there had been nearly 1,900 locally acquired dengue cases across the United States in 2026, most of them in Puerto Rico. That figure includes a U.S. territory where dengue is endemic. It is not a count of cases in the 50 states, nor evidence that the continental United States is experiencing transmission on Puerto Rico’s scale.

The CDC says most dengue cases reported in the continental United States involve travelers infected elsewhere. Local transmission has occurred in Florida, Texas, Arizona and California, as well as Hawaii. But the agency describes the risk of widespread transmission in the continental United States as low.

Both points can be true at once. People in an area with documented local transmission have reason to follow mosquito-prevention advice and public-health updates. Readers elsewhere should not mistake Florida’s concentrated outbreak or a U.S.-wide figure dominated by Puerto Rico for proof that dengue is spreading widely where they live.

Florida’s report cannot say whether local transmission will continue, decline or appear elsewhere. Nor can the current counts settle how many infections were never reported. The Sept. 26 tally describes what the state had reported by that date.

What are officials doing, and what can residents do?

Hillsborough County listed a dengue-related local emergency order dated Sept. 24 and extended the emergency Thursday. AP reported that Tampa-area workers were spraying to reduce mosquitoes and checking properties for standing water. Those actions address local conditions that allow infected mosquitoes to keep biting people.

CDC guidance calls for health departments to investigate and report infections, consider mosquito control when transmission risk rises, and explain how people can prevent bites and eliminate breeding sites. Separating travel-associated cases from local ones helps officials determine where a mosquito-control response is needed.

Residents can reduce bites by using repellent, wearing protective clothing and keeping mosquitoes out with screens or air conditioning, as CDC prevention guidance advises. Removing standing water from containers addresses places where Aedes mosquitoes lay eggs. Individual precautions do not replace case investigation, mosquito control and public information.

The CDC’s public-health guidance also recognizes that some older residents may need help clearing mosquito breeding sites. Clear instructions and practical cleanup support matter when prevention depends on what happens across a neighborhood, not just on one property.