The Florida Department of Health (FDH) in Hillsborough County has reported a fourth human case of dengue fever, a mosquito-borne illness, sparking aerial spraying efforts to curb the spread.

Flooding from Hurricanes Milton and Helene left behind extensive standing water in Tampa Bay, creating ideal breeding conditions for mosquitoes. Both Hillsborough and Polk counties are now seeing a rise in mosquito populations post-storm, increasing health concerns.

“There’s standing water everywhere. Mosquitoes breed, and this case originated from someone who brought dengue from abroad,” explained Dr. John Sinnott, an Infectious Disease Professor at USF. He noted that once dengue arrives, local water sources help it spread within close range.

“The mosquitoes spreading dengue only have about a 200-yard range, staying close to an infected person,” said Sinnott. “They usually stay in one place, within a couple of football fields.”

On October 25, the FDH in Hillsborough confirmed the fourth case of dengue, part of the 50 locally acquired cases reported across Florida this year. In response, aerial spraying with BTI, a safe, kerosene-derived agent, is underway in affected areas. “BTI has no side effects for humans,” Sinnott noted. “It’s like a light layer of suntan oil if sprayed on the skin.”

To minimize risks, Sinnott advises residents to use insect repellent, remove standing water weekly, and install screens when repairing storm-damaged homes. Buckets, birdbaths, and gutters should be emptied regularly to reduce mosquito habitats.

If infected, individuals should see a doctor. Symptoms include fever, chills, muscle aches, and nausea, and although rare, fatalities can occur. “Usually, a headache is the first sign, followed by joint pain in weight-bearing areas like knees and hips,” Sinnott said. “The pain can be intense.”

(Image credit: University of Georgia)