Dengue Fever Outbreak in Hillsborough County: Mosquito Control Measures Ramped Up

Hillsborough County, Florida is currently facing a concerning rise in dengue fever cases, prompting local health officials to sound the alarm about this potentially severe mosquito-borne viral disease. As the summer mosquito season gets into full swing, residents are urged to stay vigilant and take proactive steps to protect themselves and their families from the Aedes mosquitoes that transmit dengue.

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What is Dengue Fever?

Dengue fever is a viral illness spread through the bite of an infected Aedes species mosquito, principally Aedes aegypti. There are four distinct dengue virus serotypes, and infection with one does not provide immunity against the others. Symptoms usually begin 4-7 days after the mosquito bite and can include:

  • High fever (104°F/40°C)
  • Severe headache
  • Pain behind the eyes
  • Muscle and joint pain
  • Nausea and vomiting
  • Skin rash

Most people recover within a week, but some go on to develop severe dengue, a life-threatening complication causing severe abdominal pain, persistent vomiting, rapid breathing, bleeding gums or nose, fatigue, and restlessness. Immediate medical care is critical as severe dengue can quickly progress to hemorrhagic fever and shock.

Dengue Fever in Hillsborough County.

As of June 25, 2024, the Florida Department of Health has reported over 400 locally-acquired dengue cases in Hillsborough County since the beginning of the year, a dramatic increase from the handful of cases seen annually in the past decade. While no deaths have occurred, dozens of patients required hospitalization.

“We are definitely seeing an unprecedented spike in dengue activity this year,” said Dr. Maria Gonzalez, an infectious disease specialist at Tampa General Hospital. “The warm, wet weather has been ideal for mosquito breeding, and the COVID-19 pandemic has made mosquito control more challenging.”

Hillsborough, the fourth most populous county in Florida with over 1.5 million residents, has historically been a hotspot for mosquito-borne illnesses like West Nile virus. However, locally-acquired dengue has been rare since the 1930s. Experts believe the current outbreak is likely fueled by infected travelers introducing the virus to local Aedes mosquito populations.

“With international travel rebounding post-pandemic, we are seeing more imported dengue cases which can spark local transmission,” explained Thomas Breaud, an entomologist with the Hillsborough County Mosquito Control District. “Once the virus is circulating in the mosquitoes, it can spread rapidly, especially in densely populated urban areas.”

Factors Contributing to the Rise in Dengue Cases.

Several factors contribute to the increasing incidence of dengue fever in Hillsborough County:

  • Climate Change: Rising temperatures and increased rainfall create favorable conditions for mosquito breeding. Warmer temperatures accelerate the mosquito life cycle, leading to larger populations.
  • Urbanization: Rapid urbanization and population growth in Hillsborough County have led to increased human-mosquito interactions. Urban areas with poor drainage and stagnant water provide ideal breeding sites for mosquitoes.
  • Travel and Migration: The influx of travelers and migrants from dengue-endemic regions increases the risk of introducing the virus into the local population.
  • Lack of Awareness: Limited public awareness about dengue fever and preventive measures contributes to the spread of the disease.

Mosquito Control Measures Intensify.

In response to the burgeoning outbreak, Hillsborough County has redoubled its mosquito control efforts. Teams are working extended hours to treat standing water with larvicides and spray insecticides in high-risk neighborhoods. Door-to-door campaigns are educating residents on how to “tip, toss, and cover” water-holding containers where Aedes mosquitoes breed around homes.

“Our field techs are finding significant numbers of Aedes aegypti in communities with dengue cases,” said Breaud. “These mosquitoes prefer to breed in small artificial containers like buckets, birdbaths, and even bottle caps, so individual actions to eliminate standing water are key to controlling the outbreak.”

The county has also deployed innovative mosquito surveillance strategies, including specialized traps and testing mosquitoes for dengue virus to pinpoint high-risk zones for targeted control. GIS mapping is being used to visualize dengue case clusters and guide door-to-door mosquito control and community outreach.

Preventing Mosquito Bites.

With no specific treatment for dengue fever, preventing mosquito bites is the best defense. Hillsborough County health officials are urging the public to:

  • Use EPA-registered insect repellents with ingredients like DEET, picaridin, oil of lemon eucalyptus, or IR3535
  • Wear long-sleeved shirts and long pants, especially during peak Aedes biting times (early morning and evening)
  • Treat clothing with permethrin insecticide for added protection
  • Use window and door screens and air conditioning when possible
  • Sleep under a mosquito bed net if exposed to the outdoors

“Insect repellent is your number one weapon against dengue,” emphasized Dr. Gonzalez. “Apply it every time you go outside, even if only for a few minutes. Aedes mosquitoes are sneaky daytime biters that can strike quickly.”

The Role of Technology in Mosquito Control.

Advancements in technology have revolutionized mosquito control efforts in Hillsborough County:

  • Drones: Drones equipped with cameras and sensors are used to identify and map mosquito breeding sites. This technology allows for targeted interventions and efficient use of resources.
  • Mobile Apps: Mobile applications enable residents to report mosquito breeding sites and receive real-time updates on mosquito control activities. These apps also provide information on preventive measures and dengue symptoms.
  • Data Analytics: Big data and analytics are used to predict mosquito population trends and identify high-risk areas. This information helps in prioritizing control efforts and allocating resources effectively.

Community Involvement and Education.

Community involvement is a cornerstone of effective dengue prevention and control. Hillsborough County has implemented several initiatives to engage residents in the fight against dengue fever:

  • School Programs: Educational programs in schools teach children about dengue fever and mosquito control. These programs encourage students to take preventive measures at home and spread awareness in their communities.
  • Neighborhood Watch Groups: Local authorities have established neighborhood watch groups to monitor and report mosquito breeding sites. These groups play a vital role in identifying problem areas and facilitating timely interventions.
  • Workshops and Seminars: Workshops and seminars are conducted to educate residents about dengue fever, its transmission, and preventive measures. These events provide a platform for community members to ask questions and share their concerns.

Mosquito-Proofing Your Home.

In addition to avoiding bites, residents play a critical role in reducing mosquito breeding sites around their property. Aedes mosquitoes don’t fly far, so breeding control in one’s own yard can have a big impact. Hillsborough County officials recommend citizens:

  • Drain standing water from gutters, flowerpots, buckets, pool covers, pet bowls, and other containers
  • Discard old tires, drums, bottles and any unnecessary water-holding items
  • Empty and clean birdbaths and pet water bowls at least once a week
  • Maintain swimming pools in good condition with proper chlorination
  • Repair broken screens on windows, doors, porches, and patios

“Mosquito control is a community effort,” said Breaud. “Even one unnoticed bottle cap filled with water can breed dozens of dengue-spreading mosquitoes. It takes all of us working together to beat this outbreak.”

Vaccine and Treatment Horizons.

Currently, there is one dengue vaccine (Dengvaxia) approved in the U.S., but it is only recommended for people with laboratory-confirmed previous dengue infection and living in endemic areas. Researchers are working on new vaccine candidates that could offer protection regardless of prior dengue exposure.

Several promising antiviral drugs to treat dengue are also in development, including therapies to reduce virus replication and combat body-wide inflammation seen in severe cases. However, these are likely still years away from clinical use.

“For now, early recognition and expert supportive care are saving lives in severe dengue cases,” said Dr. Gonzalez. “But I dream of the day when we’ll have effective dengue shots and therapeutics to take the sting out of this disease. In the meantime, fighting the mosquito bite is our best shot.”

The Economic Impact of Dengue Fever.

Dengue fever not only poses a public health threat but also has significant economic implications. The costs associated with medical treatment, vector control, and lost productivity can strain local economies. In Hillsborough County, the economic burden of dengue fever is a growing concern:

  • Healthcare Costs: The treatment of dengue fever can be expensive, particularly in severe cases that require hospitalization. The increased demand for medical services can strain healthcare facilities and resources.
  • Vector Control Expenses: Mosquito control programs require substantial funding for surveillance, larviciding, adulticiding, and public education campaigns. These expenses can add up, especially during peak mosquito seasons.
  • Lost Productivity: Dengue fever can result in significant lost productivity due to illness and absenteeism. The impact on the workforce can affect various sectors, including tourism, agriculture, and services.

International Collaboration and Support.

Addressing the dengue fever threat requires international collaboration and support. Hillsborough County has benefited from partnerships with global health organizations and research institutions:

  • WHO and CDC: The World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC) provide technical support, guidelines, and resources for dengue prevention and control.
  • Research Collaborations: Collaborative research efforts with universities and research institutions help in advancing our understanding of dengue fever and developing innovative control strategies.
  • Funding and Grants: International funding and grants support local mosquito control programs and public health initiatives. These resources are crucial for sustaining long-term efforts to combat dengue fever.

Hillsborough County Health Department Recommendations.

The Hillsborough County Health Department is coordinating the local dengue response and advising citizens to:

  • See a healthcare provider immediately if experiencing dengue symptoms, especially severe abdominal pain, vomiting, difficulty breathing, or bleeding
  • Allow county mosquito control workers to inspect your property for breeding sites and spray when necessary
  • Stay up to date on the outbreak status and mosquito prevention guidance.

“This is a serious situation, but not a cause for panic,” assured Dr. Douglas Holt, Director of the Hillsborough County Health Department, in a press briefing. “By working together and following proven mosquito control and bite prevention strategies, we can stomp out dengue in our community. Stay alert, drain and cover standing water, and always wear repellent. Together, we can beat dengue.”

Disclaimer: The information provided in this article is for educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition.


Hi there!I'm C.K. Gupta, the founder and head writer at With a passion for health and wellness, I created FitnTip to share practical, science-backed advice to help you achieve your fitness goals.Over the years, I've curated valuable information from trusted resources on topics like nutrition, exercise, weight loss, and overall well-being. My aim is to distill this knowledge into easy-to-understand tips and strategies you can implement in your daily life.Whether you're looking to get in shape, eat healthier, or simply feel your best, FitnTip is here to support and guide you. I believe that everyone has the potential to transform their health through sustainable lifestyle changes.When I'm not researching the latest health trends or writing for FitnTip, you can find me trying out new fitness routines, experimenting with nutritious recipes, and spending quality time with loved ones.I'm excited to have you join our community as we embark on this wellness journey together. Let's make positive, lasting changes and unlock a healthier, happier you!

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