Key takeaways
- Vectors are living organisms, many of them bloodsucking insects and ticks, that transmit infectious pathogens between people or from animals to people (WHO).
- Vector-borne diseases make up more than 17% of all infectious diseases and cause more than 700,000 deaths a year worldwide.
- Florida reported 425 locally acquired dengue cases in 2026 through mid-October, in eleven counties including Miami-Dade, Broward and Palm Beach.
- Florida ticks can carry Lyme disease, ehrlichiosis, Rocky Mountain spotted fever and other illnesses; fleas on rats, cats and opossums can carry flea-borne typhus.
- House flies and cockroaches are mechanical carriers: they spread germs on their bodies rather than through a bite.
In this article
- What Are Vector Pests?
- How Vector Pests Spread Disease
- Vector Pests in Florida and the Diseases They Carry
- Mosquitoes: Florida’s Most Important Vector Pests
- Ticks and Fleas: Vector Pests That Travel on Pets and Wildlife
- Kissing Bugs and Chagas Disease in Florida
- Are Ants and Termites Vector Pests?
- How to Protect Your Home and Family From Vector Pests
- Frequently Asked Questions
Vector pests are insects and other small animals that spread disease-causing germs from one person or animal to another, usually through a bite. Mosquitoes, ticks and fleas are the best-known examples, and in Florida they carry illnesses such as dengue, West Nile virus, Lyme disease, ehrlichiosis and flea-borne typhus.
Not every pest is a vector. Termites damage buildings and ants can sting, but neither spreads disease the way a mosquito does. This guide explains what makes a pest a vector, which vector pests live in Florida, what they carry and how to protect your family and home.
What Are Vector Pests?
The World Health Organization defines vectors as “living organisms that can transmit infectious pathogens between humans, or from animals to humans.” Many are bloodsucking insects and ticks that pick up a germ when they feed on an infected person or animal and pass it on at a later meal. The illnesses they cause, from viruses, bacteria and parasites, are called vector-borne diseases.
The toll is large. According to the WHO, vector-borne diseases account for more than 17% of all infectious diseases and cause more than 700,000 deaths a year. Malaria alone causes an estimated 249 million cases and more than 608,000 deaths annually, and more than 3.9 billion people in over 132 countries are at risk of dengue.
How Vector Pests Spread Disease
Pests carry germs in two very different ways, and the difference changes how you control them.
Biological Vectors
In a biological vector, the germ lives and often multiplies inside the pest. A mosquito that takes blood from a person with dengue becomes infected, and after the virus multiplies it can pass it to the next person it bites. Ticks, fleas, kissing bugs and sand flies work in a similar way. Because the pest is part of the germ’s life cycle, only certain pests can spread certain diseases. That is also why COVID-19 is not a vector-borne disease; see whether coronavirus can be transmitted by pests for the research.
Mechanical Carriers
Other pests carry germs on the outside of their bodies. UF/IFAS explains that house flies pick up pathogens from garbage, sewage and manure and transfer them to human food “on their mouthparts, through their vomitus, feces, and contaminated external body parts.” The germs named include Salmonella, Shigella, Campylobacter and Escherichia. Cockroaches spread germs in a similar way as they move between drains, garbage and kitchen counters, and their allergens can trigger asthma; our article on the health risks of cockroaches in South Florida homes covers that side.
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Vector Pests in Florida and the Diseases They Carry
| Vector pest | Diseases (examples) | Florida notes |
|---|---|---|
| Aedes mosquitoes | Dengue, chikungunya, Zika, yellow fever | Aedes aegypti and the Asian tiger mosquito breed in containers around homes |
| Culex mosquitoes | West Nile virus | West Nile, eastern equine and St. Louis encephalitis are Florida health concerns |
| Anopheles mosquitoes | Malaria | Florida cases are mostly travel-associated |
| Ticks | Lyme disease, babesiosis, ehrlichiosis, anaplasmosis, Rocky Mountain spotted fever | Blacklegged, lone star, American dog and Gulf Coast ticks occur in Florida |
| Fleas | Flea-borne (murine) typhus, plague | Spread by fleas of rats, cats and opossums |
| Kissing bugs (triatomines) | Chagas disease | Infected bugs found in 12 of 23 Florida counties sampled |
| Sand flies | Leishmaniasis | Listed by the WHO as a vector worldwide |
Disease lists come from the WHO, the Florida Department of Health and the CDC.
Mosquitoes: Florida’s Most Important Vector Pests
Mosquitoes spread more disease than any other vector, and Florida’s warm, wet climate keeps them active most of the year. The Florida Department of Health’s weekly arbovirus surveillance tracks West Nile virus, eastern equine encephalitis and St. Louis encephalitis, along with travel-associated cases of dengue, chikungunya and malaria that travelers bring back. Once a traveler is infected, local Aedes mosquitoes can pick up the virus and start local transmission.
That is exactly what happened in 2026. The department’s arbovirus surveillance report counted 425 locally acquired dengue cases reported from eleven counties through October 17, including Miami-Dade, Broward and Palm Beach, with the largest cluster in Hillsborough County. Miami-Dade alone reported 200 travel-associated dengue cases and Florida’s one locally acquired chikungunya case of the year. As of mid-October, Miami-Dade was under a mosquito-borne illness alert, and Broward and Palm Beach were under advisories.
Source: Florida Department of Health, arbovirus surveillance week 41
The pattern follows the rainy season: cases climbed through the wettest, hottest months. For what this means around your home, read our guide on dengue in South Florida and what homeowners need to know about mosquitoes.
Ticks and Fleas: Vector Pests That Travel on Pets and Wildlife
Ticks
The Florida Department of Health lists the ticks that matter in the state:
- Blacklegged tick: Lyme disease and babesiosis
- Lone star tick: ehrlichiosis, anaplasmosis and STARI (southern tick-associated rash illness)
- American dog tick: Rocky Mountain spotted fever
- Gulf Coast tick: Rickettsia parkeri rickettsiosis
The department notes that most people are infected by nymphs during the spring and summer. Nymphs are tiny, so they often go unnoticed and stay attached longer. Our tick pest library shows what each species looks like, and our guide to protecting your family from tick-borne illnesses in South Florida covers checks and removal.
Fleas
Fleas are more than an itchy pet problem. The CDC explains that flea-borne typhus, caused by the bacterium Rickettsia typhi, spreads through infected fleas, most commonly the Oriental rat flea and the cat flea. Infected flea feces get into a bite wound or other break in the skin, or are rubbed into the eyes. Rats, cats and opossums can carry infected fleas, and free-roaming cats, rats and opossums are particular risk factors.
Symptoms usually begin 3 to 14 days after exposure and can include fever, chills, body aches, headache, nausea and a rash. There is no vaccine. The CDC advises keeping fleas off pets with products your veterinarian recommends, not using permethrin on cats, and keeping rodents and opossums away by sealing entry holes, storing food in sealed containers and keeping trash lids closed. See our flea pest library for identification.
Kissing Bugs and Chagas Disease in Florida
Kissing bugs, also called triatomines or conenose bugs, are bloodsucking insects that can carry Trypanosoma cruzi, the parasite that causes Chagas disease. A 10-year University of Florida study of more than 300 insects found that 29.5% carried the parasite, with infected insects in 12 of the 23 Florida counties where they were collected. More than one-third of the insects were collected inside homes, and most bugs collected indoors had fed on humans.
No bugs turned up at four additional sites surveyed in southern Florida, a gap the researchers say needs further study, but they concluded that Florida has all the necessary conditions for vector-borne and possible oral transmission of Chagas disease. They recommend moving woodpiles away from homes and pets and managing habitat rather than relying on pesticides alone. If you find a bug indoors that you suspect is a kissing bug, avoid handling it with bare hands and contact your county extension office for identification.
Are Ants and Termites Vector Pests?
No. Termites cause serious structural damage but do not spread disease to people, and ants are a nuisance or, in the case of fire ants, a stinging hazard rather than vectors. Many pests that are not vectors still affect health in other ways, through stings, bites, allergens or food contamination. The term “public health pest” is broader than “vector” for that reason: it includes mechanical carriers and allergen sources such as cockroaches and rodents as well as true vectors.
Public health agencies and pest professionals manage all of them with integrated pest management (IPM): removing what attracts the pest, keeping it out of buildings, monitoring and using targeted treatments when needed, rather than relying on spraying alone.
How to Protect Your Home and Family From Vector Pests
| Vector pest | What you can do |
|---|---|
| Mosquitoes | Drain standing water weekly; repair screens; use an EPA-registered repellent; cover skin |
| Ticks | Check yourself, children and pets after time outdoors; keep grass mowed and brush trimmed |
| Fleas | Keep pets on veterinarian-recommended flea control; discourage rats, cats and opossums |
| Kissing bugs | Seal cracks in walls and around doors; screen windows and doors |
| House flies and cockroaches | Lidded trash cans; covered food; fix leaks; seal gaps |
When mosquitoes are a constant problem, Toro’s mosquito control service starts with a free inspection to find where they breed and rest, then treats resting shrubs with a plant-oil barrier and breeding sites with larvicide and growth regulators, with a one-time treatment or a 3-month plan. For fleas, cockroaches and other pests in and around the home, Total Home Protection Gold 365 is an every-other-month interior and exterior service. Toro has protected South Florida homes since 1969 and responds within 24 hours, guaranteed.
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305-594-4767Frequently Asked Questions
Which vector pest is the most dangerous?
Can you get malaria in Florida?
Can vector-borne diseases spread from person to person?
Do house flies spread disease even though they do not bite?
Are kissing bugs found in South Florida homes?
Sources
- Vector-borne diseases, World Health Organization
- Florida Arbovirus Surveillance: Week 41, October 11-17, 2026, Florida Department of Health
- Ticks in Florida, Florida Department of Health
- About Flea-borne Typhus, Centers for Disease Control and Prevention
- New study suggests Florida Chagas disease transmission, University of Florida, Department of Epidemiology
- House fly, Musca domestica Linnaeus (Insecta: Diptera: Muscidae), UF/IFAS Extension
Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.
