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Florida health officials have reported more than 250 locally acquired dengue cases this year, making the outbreak the largest in a U.S. state in decades based on available records. Most cases are in Hillsborough County near Tampa; one person has died, and the outbreak’s cause and future spread remain uncertain.
Florida has recorded more than 250 locally acquired dengue cases this year, state health officials reported, making the outbreak the largest in a U.S. state in decades based on available records. Most cases are in Hillsborough County, home to Tampa, and one person has died.
State figures cited in the report put locally acquired cases at 252, compared with 245 travel-associated cases in Florida as of the previous week. At least 13 Hillsborough County cases were diagnosed in travelers, according to the state. The locally acquired infections are those believed to have been transmitted by mosquitoes within the state, rather than contracted abroad.
The outbreak came to light in July. Officials in Hillsborough and nearby counties have declared local emergencies, while crews in the Tampa area have been spraying for mosquitoes and checking properties for standing water where they may breed. Florida reported one dengue death this year: an elderly Tampa woman who died Sept. 4.
Available state records and medical-journal reports suggest no state has reported as many cases in a calendar year since at least the 1940s, the report said. Federal officials have cautioned that their dengue outbreak data are limited. Florida’s previous worst year was 2023, when the state reported just under 200 locally transmitted cases.
Tampa Faces a Sustained Mosquito Threat
The case count matters because it signals substantial local transmission, not only infections brought home by travelers. It also places the outbreak near the reported scale of Hawaii’s 2015-16 outbreak, when 264 locally acquired cases were recorded over six months. Florida’s current total is already close to that figure, though the two outbreaks’ timelines and conditions differ.
Dengue infection can cause fever, flu-like symptoms and severe aches, while some people do not develop symptoms. Severe illness can involve bleeding, shock and death. The single death reported in Florida underscores that the disease can have serious consequences, but the source material does not give a broader breakdown of severity or outcomes among this year’s cases.
The outbreak is also a public-health concern because dengue-transmitting mosquitoes are present in Florida and can bite during the day. Local spraying and removal of breeding sites are intended to reduce mosquito numbers, while individual precautions can lower the chance of being bitten.
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How Florida Reached This Record
For decades, dengue cases in the continental United States were largely associated with international travel, alongside ongoing local transmission in Puerto Rico. In 2009-10, Key West reported locally acquired cases, the first such cases in the continental U.S. outside the Texas-Mexico border since 1945, according to the report.
Hawaii recorded the largest state outbreak reported in the period since then, with 264 locally acquired cases over six months in 2015-16. Florida usually has the most locally transmitted cases among the 50 states, while Puerto Rico has far higher case numbers than any state. The report says Florida’s current outbreak is unusual in its concentration around Tampa; cases have more often been centered in southern Florida, including the Miami area.
Tulane University dengue expert Dawn Wesson said travel patterns may partly explain the Tampa-area surge, but described the reasons as uncertain. The report also notes that warm-weather mosquito species that can spread dengue have expanded their geographic reach, which experts associate with climate change. Globally, more than 2.2 million infections and nearly 1,200 deaths had been reported this year, according to the World Health Organization. CDC figures cited in the report put locally acquired U.S. cases at nearly 1,900, most in Puerto Rico.
““There’s a good chance that this is the new normal.””
— Dawn Wesson, a Tulane University expert on dengue and other mosquito-borne diseases
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Why Tampa’s Cases Rose
The reason for the concentration around Tampa is not established. Wesson said travel patterns may have contributed, but the report does not identify a confirmed source or a single cause for the increase. Although Florida’s locally acquired count had edged past its travel-associated total in the figures cited, the difference was narrow, and some Hillsborough cases were linked to travelers.
Federal dengue outbreak data are limited, making historical comparisons less definitive. The claim that this is the largest state outbreak in decades rests on available state-health-department and medical-journal information, rather than a complete federal record. The CDC has not sent disease investigators to Florida; spokesman Jason McDonald said the agency must be invited by state officials and that Florida had not requested investigators. He said the CDC provided $800,000 in assistance to the state health department.
The source material does not provide a final case total, a detailed account of how many infections were severe, or a forecast for how long transmission will continue. It also does not establish how much climate change contributed to this specific outbreak.
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Mosquito Control and Case Tracking
County and state health officials are continuing mosquito-control work, including spraying and inspections for standing water. Case counts may change as additional infections are identified and classified as locally acquired or travel-associated. The report does not specify a date for a final tally or a planned review of the outbreak.
People in affected areas can reduce exposure by removing pooled water around homes, using EPA-registered repellents such as those containing DEET, and wearing loose-fitting long sleeves and long pants. Screens and air conditioning can also help limit mosquito bites. These are general prevention measures described by experts in the report, not a substitute for medical care. Anyone concerned about symptoms or possible exposure should contact a qualified health professional.
The next indicators to watch are whether local case numbers continue to rise, whether transmission spreads beyond the Tampa-area concentration, and whether Florida requests additional federal investigative support. None of those developments is confirmed in the source material.
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Key Questions
How many locally acquired dengue cases has Florida reported?
State figures cited in the report put Florida’s locally acquired cases at 252 as of the preceding week. The total may change as officials update their count.
Where is the outbreak concentrated?
The vast majority of reported cases are in Hillsborough County, which includes Tampa. Officials have also declared local emergencies in nearby counties.
Is this the largest dengue outbreak in the continental United States?
Based on available state records and medical-journal reports, the current outbreak appears to be the largest in a U.S. state in several decades. The comparison is not definitive because federal outbreak data are limited.
How is dengue spreading in Florida?
Dengue spreads through bites from infected mosquitoes. Florida’s locally acquired cases indicate transmission within the state, but officials have not established why cases surged around Tampa. Travel patterns may have played a role, according to a dengue expert cited in the report.
What can people in affected areas do to reduce mosquito bites?
The report recommends using EPA-registered insect repellent, wearing long sleeves and pants, using screened or air-conditioned indoor spaces, and removing standing water around properties. People with health concerns should consult a qualified health professional.
Source: rss
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