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Florida health officials have reported more than 250 locally acquired dengue cases this year, the largest calendar-year total in a U.S. state in decades based on available records. Most cases are in Hillsborough County near Tampa, where local authorities are spraying for mosquitoes and checking properties for breeding sites. The precise reasons for the surge remain unclear.
Florida health officials have counted more than 250 locally acquired dengue cases this year, making the outbreak the largest calendar-year total reported by a state in the continental United States in decades, according to available state records and medical-journal reports. Most cases are in Hillsborough County, home to Tampa, and local authorities are stepping up mosquito-control work as the outbreak continues.
The tally puts Florida’s current outbreak above the state’s previous worst year: just under 200 locally spread cases in 2023. The total is also approaching the largest reported state outbreak since 2009: Hawaii recorded 264 locally acquired cases over six months in 2015–2016. Florida’s count could surpass that figure if cases continue, but the source report described it as nearing that mark, not as having passed it.
State figures cited in the report showed 252 locally acquired cases and 245 travel-associated cases in Florida as of the prior week. At least 13 cases in Hillsborough County were diagnosed in travelers, according to the state. The outbreak is centered just north of Tampa. Officials in Hillsborough and nearby counties have declared local emergencies, while crews spray for adult mosquitoes and inspect properties for standing water where mosquitoes can breed.
Florida has also reported one dengue death this year: an elderly Tampa woman who died Sept. 4, according to the source report. Dengue infection may cause no symptoms, but illness can include fever, flu-like symptoms and severe aches. In some cases, it can lead to bleeding, shock or death. These details describe possible outcomes; the report does not indicate that severe illness is typical for everyone infected.
A Record Surge Near Tampa
The rise matters because it signals sustained local transmission, not only infections among people who were exposed while traveling. Dengue is spread by mosquitoes that live in Florida, so cases in the Tampa area create a risk of further spread where infected mosquitoes can bite other people. The number of locally acquired cases has now slightly exceeded the travel-associated count in the state figures cited by the report, though the two totals remain close.
The outbreak also puts pressure on local public-health and mosquito-control teams. Spraying and removing standing water aim to reduce mosquito populations, while residents in affected areas can lower exposure by using EPA-registered repellent, wearing long sleeves and pants, and limiting exposure to mosquitoes. The outbreak does not mean every resident is infected or will become ill; the immediate concern is continued transmission and the possibility of severe cases.
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How Florida Reached This Point
For much of the continental United States, dengue infections have historically been linked to international travel, while locally transmitted cases have been more common in Puerto Rico. The report says Key West recorded locally acquired dengue in 2009–2010, the first such continental U.S. cases outside the Texas-Mexico border region since 1945. Florida typically records the most locally transmitted cases among the 50 states, often around the Miami area.
The Tampa-area outbreak first came to light in July. Experts cited by MedPage Today said Florida’s frequent travel connections to Puerto Rico and other places where dengue circulates may contribute to introductions of the virus. But the cause of the concentration around Tampa this year is not established. The report notes that warm-weather mosquito species capable of transmitting dengue are found in Florida and that experts say their range has been expanding as the climate changes; that broader trend does not by itself explain this outbreak.
Dengue has four virus types. A first infection builds lasting antibodies against that type, but a later infection with another type can be more complicated because antibodies from the first infection may not neutralize the second, according to the source report. Tulane University dengue expert Dawn Wesson said most people in the Tampa area are thought to lack prior immunity to any dengue type. Globally, the World Health Organization reported more than 2.2 million infections and nearly 1,200 deaths this year, while the CDC figure cited in the report was nearly 1,900 locally acquired U.S. cases, most in Puerto Rico.
““There’s a good chance that this is the new normal.””
— Dawn Wesson, PhD, Tulane University expert on dengue and mosquito-borne diseases
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What Is Driving Tampa’s Outbreak
It is not yet clear why cases are concentrated near Tampa this year. Wesson said travel patterns may be part of the explanation, but the report did not establish a specific source or chain of transmission for the outbreak. Florida’s locally acquired and travel-associated case totals were close in the latest figures cited, and some Hillsborough cases involved travelers.
The record comparison also has limits: federal officials say their data on dengue outbreaks are limited, and the comparison with past state totals draws on available state health department information and medical journals. The tally may change as new cases are reported. The report did not provide a forecast for when transmission might decline, nor did it specify how many infections may go undiagnosed.
Florida has not requested that CDC disease investigators come to the state, according to the CDC spokesman quoted in the report. The agency has provided financial assistance, but the source material does not detail how that funding is being used or whether federal field support will be requested later.
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Mosquito Control and Case Tracking
Local crews are continuing mosquito spraying and property inspections in the Tampa area, with efforts focused on killing mosquitoes and removing standing water that can serve as breeding habitat. State and county case counts will show whether transmission continues to rise and whether Florida passes Hawaii’s 264-case total from 2015–2016.
Health authorities and residents will also need to watch for new infections and reduce mosquito bites. The source report advises people in outbreak areas to use EPA-registered repellents, wear loose-fitting long clothing, stay in screened or air-conditioned spaces where possible, and empty pooled water from their property. No timeline for ending the outbreak was provided. Future case reports and any change in state or federal response will help clarify its trajectory.
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Key Questions
How many locally acquired dengue cases has Florida reported?
State officials reported more than 250 locally acquired cases this year. The report cited a count of 252 as of the prior week; case totals can change as new infections are recorded.
Where is the outbreak concentrated?
Most cases are in Hillsborough County, which includes Tampa. The outbreak is centered just north of Tampa, according to the report.
Is this the largest dengue outbreak in the United States?
The report describes it as the largest calendar-year outbreak recorded in a state in the continental United States in decades, based on available state and medical-journal records. Puerto Rico, which is not one of the 50 states, often reports far higher case numbers. Hawaii reported 264 locally acquired cases over six months in 2015–2016, a total Florida was nearing in the figures cited.
Why are there so many cases around Tampa?
The specific reason is not known. A dengue expert cited in the report said travel patterns may contribute, but the available information does not establish a single cause for the Tampa-area concentration.
What are local officials doing to limit transmission?
Workers are spraying to reduce mosquito populations and checking properties for standing water where mosquitoes may breed. People in affected areas can also use EPA-registered insect repellent, cover exposed skin and remove pooled water around their homes.
Source: rss
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