The Florida Department of Health is investigating whether dengue was responsible for the death of a Hillsborough County resident, the agency confirmed, as locally acquired cases across the state climbed to 111, with 95 of them in Hillsborough alone.
The department has not attributed the death to dengue. Hillsborough health department spokeswoman Claire Maher told WUSF that the department is actively investigating the case and that, citing privacy rules, "the department is unable to provide additional details and information about specific cases." Family members told the Tampa Bay Times that an 80-year-old South Tampa woman who died on Sept. 4 may have been infected locally.
For Tampa Bay households, the change is concrete. Until now, local dengue was a rising case count. It is now a case count attached to an open death investigation in a county whose weekly total jumped by 36 in a single reporting period.
An Investigation That Has Not Established a Cause
Dengue rarely kills in the United States. Most U.S. infections occur in travelers returning from regions where the virus circulates year-round, and severe disease is the exception rather than the rule.
Severity risk rises with a second infection by a different dengue serotype, and it rises with age and underlying illness. Relatives have said the Tampa woman had been infected before, but officials have not confirmed that, and the health department has not released the patient's serotype, prior infection history, or the date it expects to finish its review.
Readers should treat the link as unestablished. Officials have confirmed an investigation, not a cause.
Tampa Bay Now Carries Nearly All of Florida's Local Transmission
The state's Week 35 arbovirus surveillance report, covering Aug. 30 through Sept. 5, put locally acquired dengue at 111 cases statewide across six counties: Hillsborough with 95, Miami-Dade with seven, Pinellas with five, Pasco with two, and one each in Orange and Palm Beach. Hillsborough's count rose from 59 the previous week, and the statewide total rose from 73. Eleven Florida counties are now under either a mosquito-borne illness advisory or the higher-level alert.
Florida Surgeon General Dr. Joseph Ladapo described Hillsborough as the epicenter of local dengue transmission in the state earlier this month. Dr. Kartik Cherabuddi, chief hospital epidemiology officer at Tampa General Hospital and a professor of infectious diseases at USF, told a Tampa station that "we've never had this many local cases in the mainland U.S." and said you would have to go back to the 1930s and 1940s, when dengue was locally endemic in Florida, to find numbers this high.
The surveillance data point to sustained local circulation rather than repeated separate introductions by returning travelers. Ninety-three percent of the state's local cases, 103 of 111, have been typed by PCR as DENV-2, and 16 dengue-positive mosquito pools have been reported from six counties this year, including two more collected in Hillsborough during the latest reporting week. Florida has also logged 160 travel-associated dengue cases in 2026, and that imported burden is the reservoir from which local chains begin.
Mosquito control agencies in Hillsborough and Pinellas have stepped up aerial spraying, working day and night with assistance from Pasco and Manatee crews. Crews are conducting biological sampling, responding to individual cases and searching for active breeding sites. Dr. Carla Fry, administrator and health officer for the Florida Department of Health in Hillsborough County, told WFLA that the outbreak may take time to slow: "Once you start to have a dengue outbreak, because so many people are running around asymptomatic, they can be spreading it by getting bit by a mosquito who then bites another person."
Daytime Biters Change the Household Routine
The mosquitoes that carry dengue, Aedes aegypti and Aedes albopictus, feed during the day and are most active around sunrise and sunset. That makes evening-only precautions insufficient.
Health officials recommend three actions: spray, cover, and drain. Use an EPA-registered repellent containing DEET, picaridin, IR3535, oil of lemon eucalyptus, para-menthane-diol or 2-undecanone. Wear loose, long-sleeved shirts and long pants outdoors. Empty anything holding water around the house, including gutters, saucers, buckets, toys, pet bowls, and discarded tires.
Dengue causes fever with severe muscle and joint pain, headache, and sometimes a rash, generally three to 14 days after a bite. It is not contagious between people. Severe abdominal pain, persistent vomiting, bleeding gums or nosebleeds, and extreme fatigue require urgent evaluation, particularly in older adults and anyone previously infected. There is no specific antiviral treatment, and no dengue vaccine is available for general use in the United States. Care is supportive: rest, fluids, and acetaminophen rather than other pain relievers.
Florida publishes its surveillance report weekly, and the next edition will show whether Hillsborough's increase is continuing. The health department has not said when its death review will conclude. Until the review closes, the honest summary is narrow. One death is under investigation, local transmission is concentrated in one county, and the single most effective household action is removing standing water and using repellent during daylight hours.
Key Questions Answered
What is the new development? The Florida Department of Health confirmed it is investigating a Hillsborough County death possibly associated with dengue, and the weekly surveillance report put local cases at 111 statewide.
Has dengue been confirmed as the cause of death? No. The department said the investigation is active and has not released a determination.
What does locally acquired mean? The person was infected by a mosquito in Florida rather than while traveling, indicating the virus is circulating in local mosquitoes.
Who faces the greatest risk? Older adults, people with underlying conditions, and anyone previously infected with a different dengue serotype, since a second infection raises the risk of severe disease.
What symptoms should Tampa Bay residents watch for? Sudden high fever with severe muscle and joint pain, headache, and sometimes rash. Severe abdominal pain, persistent vomiting, or bleeding needs urgent care.
How can households reduce risk? Use EPA-registered repellent during daylight hours, wear long sleeves and long pants, and drain standing water in gutters, saucers, buckets, and tires weekly.
Is dengue contagious? No. It spreads only through the bite of an infected Aedes mosquito.
