Florida Dengue Outbreak: Everything To Know After First Death Is Confirmed

Florida health officials confirmed a death from dengue fever on Friday, September 18, 2026, as the state continues to deal with an unusual outbreak centered in Hillsborough County near Tampa.

The Florida Department of Health did not release further details about the death, but the Tampa Bay Times reported that the person was an elderly Tampa woman who died September 4.

The death comes as Florida records one of its largest recent surges in locally acquired dengue cases. The state has reported 152 locally acquired cases so far this year, according to the Florida Department of Health, putting 2026 second only to 2023, when nearly 200 locally acquired cases were recorded. Hillsborough County alone has reported more than 130 cases, far above the handful of cases it typically sees.

Why is this outbreak unusual?

Dengue is a viral infection spread by mosquitoes, particularly mosquitoes that thrive in warm conditions. Most dengue cases reported in the United States historically involved people who became infected while traveling abroad.

Local transmission in the continental U.S. has been much less common. Florida recorded locally acquired dengue cases in Key West in 2009 and 2010, marking the first such cases in the continental United States outside the Texas-Mexico border region since 1945.

Chris Wilkerson, a spokesperson for Hillsborough County, described the current situation as highly unusual.

“This is wildly unusual for us,” Wilkerson said.

How did the Florida outbreak grow?

Dengue outbreaks can begin when an infected person returns from an area where the virus is circulating. If a mosquito capable of transmitting dengue bites that person, the mosquito can then spread the virus to other people.

Michael von Fricken, an associate professor of environmental and global health at the University of Florida, said Florida has conditions that can allow this cycle to continue.

The state has recurring populations of mosquitoes capable of spreading dengue, meaning the risk may remain even after the current outbreak slows.

“I do think it’s going to be somewhat the new normal,” von Fricken said.

Health officials are now working to interrupt mosquito transmission. In Hillsborough County, mosquito-control workers have been spraying areas day and night and checking properties for standing water.

That includes water collected in objects such as discarded tires, which can provide breeding sites for mosquitoes.

What are the symptoms of dengue?

Many people infected with dengue do not develop noticeable illness. When symptoms occur, they can resemble other viral infections.

Most infections do not progress to severe disease, but some can become dangerous. Severe dengue can cause serious bleeding, shock, and, in some cases, death.

The confirmed Florida death highlights the potential severity of the infection, although health officials have not released enough information to determine the circumstances of that particular case.

Are dengue cases still increasing?

Recent mosquito testing in Hillsborough County has not detected the virus, according to Paolo Pecora, a senior environmental scientist with Hillsborough County Mosquito Management Services.

Pecora said that the finding suggests the likelihood of new infections may be declining.

However, officials and researchers are not treating the mosquito threat as permanently gone. Warm weather can support mosquito populations, while standing water can provide breeding locations.

Florida’s current total of 152 locally acquired cases already represents the state’s second-highest annual number. Health officials also warn that reported cases may not represent every infection because many people with dengue experience few or no symptoms.

Is dengue a problem outside Florida?

The outbreak is part of a wider global dengue burden. The World Health Organization has reported more than 2.2 million infections worldwide so far this year, with nearly 1,200 deaths.

In the United States, the Centers for Disease Control and Prevention has recorded nearly 1,500 locally acquired cases, most of them in Puerto Rico.

For Florida, the immediate focus remains on mosquito control and preventing further local transmission. The confirmed death adds urgency to that effort, while recent mosquito sampling offers some indication that the current outbreak may be losing momentum.

The larger concern, experts say, is that the conditions that allow dengue-carrying mosquitoes to thrive are not disappearing, meaning Florida could continue to face local dengue transmission in the future.