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Florida 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, and authorities are spraying for mosquitoes as the outbreak continues; one Florida resident has died.
Florida has recorded more than 250 locally acquired dengue cases this year, state health officials reported this week, making the outbreak appear to be the largest in a continental U.S. state in decades. Most cases are in Hillsborough County, which includes Tampa, where mosquito-control crews are spraying and checking properties for breeding sites.
Available state data and published medical records suggest Florida’s total is the highest for any state in a calendar year since at least the 1940s, according to MedPage Today. The comparison is subject to limits in historical outbreak records, and federal health officials say their dengue data are limited. Florida’s previous highest year was 2023, with just under 200 locally acquired cases.
The Tampa-area outbreak came to attention in July. As of the week before the report, Florida had recorded 252 locally acquired cases and 245 travel-associated cases, a narrow difference. At least 13 cases in Hillsborough County were diagnosed in travelers, according to state figures cited by MedPage Today. One person, an elderly Tampa woman, died on Sept. 4.
Local authorities in Hillsborough and nearby counties have declared emergencies. In the Tampa area, crews are spraying to reduce adult mosquito populations and inspecting properties for standing water, including water collected in tires. The U.S. Centers for Disease Control and Prevention has provided $800,000 in assistance to Florida’s health department, CDC spokesman Jason McDonald said. The agency’s disease investigators have not been asked to come to the state, he said.
Tampa Faces Rising Local Dengue Risk
Dengue is transmitted by mosquitoes and can cause fever, flu-like symptoms and severe muscle and joint pain. Many infected people do not develop symptoms, but severe illness can involve bleeding, shock and death. The death reported in Florida this year underscores that the outbreak is not only a case-count concern, although the source material does not establish how the woman became infected or provide further clinical details.
The outbreak is also notable because local transmission has exceeded travel-associated cases in Florida, at least in the figures reported for the week before publication. That marks a shift in the immediate pattern of cases, though the totals were close and some Hillsborough cases involved travelers. For people living in affected areas, it increases the importance of mosquito control and bite prevention while the outbreak is active.
The Florida tally is nearing the 264 locally acquired cases reported in Hawaii over six months in 2015–2016, the largest state outbreak identified in the source report since 2009–2010. Florida’s current figure was already above 250, but whether it had passed Hawaii’s total was not confirmed in the report.
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How Florida Reached This Record
Dengue has four virus types. Infection with one type generally produces lasting antibodies to that type, but a later infection with another type can be more complicated: antibodies from the first infection may not neutralize the second and can, in some cases, help it enter immune cells. That interaction has made development of an effective vaccine difficult.
Most people in the Tampa area are not thought to have prior immunity to any dengue type, Dawn Wesson, a Tulane University expert on dengue and mosquito-borne diseases, told MedPage Today. Florida’s warm climate supports mosquitoes capable of transmitting the virus. The state also receives travelers from places where dengue is circulating, Wesson said; historically, many Florida cases have been concentrated around Miami.
Locally acquired dengue outside Puerto Rico and the Texas-Mexico border was rare on the continental mainland for decades. Key West reported locally acquired cases in 2009–2010, the first such cases there since 1945, according to the report. Puerto Rico continues to experience much higher case numbers than any of the 50 states. Worldwide, more than 2.2 million infections and nearly 1,200 deaths had been reported this year, while the CDC tally cited by MedPage Today 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, Tulane University dengue and mosquito-borne disease expert
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Outbreak Causes and Scale Remain Unsettled
The exact reasons for the surge around Tampa have not been established. Wesson said travel patterns may be one factor but cautioned that it is difficult to explain why the area is seeing so many cases this year. The source report also does not identify the dengue type or types involved in the outbreak, or provide a detailed breakdown of cases by date, location and infection severity.
The claim that this is the largest state outbreak in decades rests on available state records and medical publications, while federal officials say their data are limited. The total was still rising when reported, and the account does not give a later final count. It also does not establish whether the Florida outbreak has surpassed Hawaii’s 264-case total.
Florida officials have not asked the CDC to send disease investigators, according to the agency’s spokesman. The reasons for that decision were not provided in the source material. It is also unclear how long mosquito-control operations will continue or whether local authorities will expand emergency measures.
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Mosquito Control and Case Counts Continue
State and local officials are continuing mosquito-control work, including spraying and inspections for standing water. The next important indicator is whether new locally acquired cases continue to be reported and whether the outbreak remains concentrated in Hillsborough County or appears elsewhere.
People in affected areas can reduce exposure by using EPA-registered insect repellents, wearing loose-fitting long sleeves and pants, staying in screened or air-conditioned spaces, and removing standing water from their properties. Dengue-carrying mosquitoes can bite during the day, so protection should not be limited to nighttime. These measures are public-health precautions described by experts in the source report; they do not replace guidance from local health authorities.
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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 252 cases as of the week before publication; the total may change as officials update their counts.
Where is the outbreak concentrated?
The vast majority of Florida’s reported cases are in Hillsborough County, home to Tampa. The outbreak was described as centered just north of Tampa.
Is Florida’s outbreak the largest in the continental United States?
Based on available state records and medical-journal information, it appears to be the largest outbreak in a continental U.S. state in a calendar year since at least the 1940s. Historical data are limited, and the report did not confirm whether Florida had surpassed Hawaii’s 264 locally acquired cases from 2015–2016.
How are local authorities responding?
Crews are spraying to reduce mosquitoes and inspecting properties for standing water where mosquitoes may breed. Hillsborough and nearby counties have declared local emergencies. The CDC has provided financial assistance to Florida, but its investigators have not been asked to come to the state.
What can people in affected areas do to reduce mosquito bites?
Experts cited in the report recommend EPA-registered repellents, covering skin with loose-fitting clothing, using screens or air conditioning, and removing standing water. Dengue-carrying mosquitoes can bite during the day as well as around sunrise and sunset.
Source: rss
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