Dengue Fever Alert: Orange County, Florida 2026

Orange County has joined a growing list of Florida counties dealing with locally transmitted dengue fever in 2026. As of mid-September, the Florida Department of Health confirmed three locally acquired cases in Orange County, placing the county under an official Mosquito-borne Illness Alert. Statewide, more than 150 locally acquired dengue cases have been confirmed this year, making 2026 one of the most active dengue seasons in Florida's recent history.

What Is Dengue Fever?

Dengue fever is a viral illness transmitted through the bite of infected mosquitoes. It is not spread from person to person. The virus requires a mosquito to move from one host to another.

Symptoms typically appear three to fourteen days after a bite from an infected mosquito. Early signs include sudden high fever, severe headache, pain behind the eyes, and intense muscle and joint pain so severe that dengue is often referred to as "breakbone fever." Some people also experience rash, nausea, and mild bleeding from the gums or nose.

Most cases are self-limiting and resolve within four to seven days. However, a small percentage of infections can progress to severe dengue, which may involve internal bleeding, organ damage, and is potentially fatal without medical care. There is no specific antiviral treatment for dengue. Management is supportive: rest, fluids, and fever control with acetaminophen. Aspirin and ibuprofen should be avoided, as they can increase bleeding risk.

What Mosquito Is Responsible?

Dengue in Florida is transmitted primarily by Aedes aegypti, the yellow fever mosquito. Aedes albopictus, the Asian tiger mosquito, is a secondary vector. Both species are well established throughout Central Florida.

These mosquitoes behave very differently from the larger species most people think of when they picture a mosquito problem. They are small, black and white, and they bite during the day rather than at dusk and dawn. They are aggressive biters that tend to target the lower legs and ankles. And they breed in very small amounts of standing water.

A female Aedes aegypti can lay eggs in as little as a bottle cap of water. That means any container in your yard that holds water after rain is potential breeding habitat: plant saucers, clogged gutters, bird baths, tarps, pool covers, trash can lids, tires, and even small puddles in uneven ground. After a Florida afternoon thunderstorm, new breeding sites can appear across a yard within hours.

What Is Happening in Florida in 2026?

Dengue transmission in Florida has been documented periodically since a 2009 outbreak in Key West. What is different about 2026 is the geographic spread and case volume. The Florida Department of Health has confirmed locally acquired dengue cases in Hillsborough, Miami-Dade, Orange, Palm Beach, Pasco, and Pinellas counties this year. The majority of cases are concentrated in Hillsborough County, but the spread into Orange County is notable for Central Florida residents.

The bulk of 2026 cases had onset in July and August, with cases continuing into September. Dengue transmission follows mosquito activity, which in Florida's warm, humid climate remains elevated well into fall.

What Orange County Residents Should Do Right Now

Orange County Mosquito Control is conducting mitigation and surveillance operations in affected areas. That addresses mosquito populations in public spaces. What it does not cover is the breeding habitat in your own yard.

The most important steps any homeowner can take:

• Dump and drain any standing water on your property at least once a week
• Clean and scrub birdbath basins weekly to remove mosquito eggs from the walls
• Check gutters and clear any debris that traps water
• Cover or store containers that collect rain
• Use tight-fitting lids on trash cans
• Treat ornamental water features with larvicide if they cannot be drained
• Wear long sleeves, pants, and EPA-registered repellent when outdoors, especially in early morning and late afternoon

If you want a professional treatment in place, a mosquito control program targeting adult mosquitoes and active breeding sites in your yard is the most effective property-level intervention available. These treatments significantly reduce the adult mosquito population on your property and address breeding sources simultaneously.

How Pest Pro Can Help

Pest Pro LLC provides residential and commercial mosquito control programs throughout Orange, Osceola, Lake, Polk, and Seminole counties. Our treatment approach targets adult mosquitoes in their resting areas and identifies breeding sites across the property for source reduction and larviciding.

With an active dengue alert in Orange County, now is not the time to wait on mosquito control. Call us to schedule a free consultation and get a treatment in place.

Call (407) 922-2276 or schedule online. Mon–Sun 8AM–6PM, 24/7 emergency line.