Florida, United States: Three counties in Florida have declared states of emergency as locally transmitted dengue fever cases continue to rise, prompting authorities to intensify mosquito-control operations and public-health measures.

Hillsborough, Pasco and Pinellas counties have taken emergency measures amid increasing dengue activity. Hillsborough County alone had recorded 134 confirmed cases as of September 24, according to recent health reporting.

Locally Transmitted Cases Raise Concern

Dengue is primarily spread through infected Aedes mosquitoes, including Aedes aegypti and Aedes albopictus. Unlike travel-associated infections, locally acquired cases indicate that mosquitoes in the affected area are transmitting the virus.

Florida has reported both travel-related and locally acquired dengue infections during 2026, with the state’s total reaching hundreds of cases.

Symptoms of Dengue

Dengue commonly causes high fever, severe headache, muscle and joint pain and fatigue.

Most infections recover with appropriate medical care, but some patients can develop severe dengue, which can cause serious bleeding, shock and other potentially life-threatening complications.

People who develop significant symptoms after possible mosquito exposure are advised to seek medical attention.

Mosquito Control Intensified

The emergency declarations allow local authorities to coordinate additional resources for mosquito-control activities, public education and emergency planning.

Officials are focusing on reducing mosquito populations and limiting opportunities for mosquitoes to breed.

Residents are also being encouraged to remove standing water around homes and other properties because containers holding even relatively small amounts of water can provide breeding sites.

Florida Monitoring Transmission

Health authorities are continuing to monitor dengue infections to determine where local transmission is occurring and how widely the virus is circulating.

Recent mosquito surveillance has provided some encouraging signs in certain areas, although officials continue to treat the outbreak seriously.

A Growing Public-Health Challenge

Dengue has traditionally been associated with tropical and subtropical regions, but changing environmental conditions and expanding mosquito habitats have increased attention on transmission in parts of the United States.

Florida’s latest outbreak highlights the importance of mosquito surveillance, rapid diagnosis and community participation in controlling mosquito-borne diseases.