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Beware Florida: New mosquito found ‘thriving’ in 3 counties may spread, transmit disease

NewsBeware Florida: New mosquito found 'thriving' in 3 counties may spread, transmit disease

  • Not all mosquitoes bite or spread disease, but they are common around the world
  • Between 750,000 and 1 million people die each year of mosquito-borne illnesses

Scientists are concerned about the spread of a new mosquito species found “thriving” in at least three South Florida counties because it could transmit diseases such as West Nile virus and St. Louis encephalitis.

Culex lactator native to South and Central America, has been found in Lee, Collier and Miami-Dade counties so far.

“I expect it to spread throughout South Florida and northward along both coasts,” said Lawrence Reeves, a researcher at the University of Floridspan Medicspanl Entomology Lspanborspantory in Vero Beach, whose team discovered it.

Florida already has a well-publicized invasive species problem thanks to Burmese pythons, lionfish, iguanas and giant land snails. The new mosquito is the sixth nonnative mosquito species to invade Florida in five years and the 11th in about two decades. That is alarming mosquito control officials.

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Lawrence Reeves, a researcher with the University of Florida Entomological Laboratory in Vero Beach, uses an aspirator to collect mosquitoes in a marsh near Miami.
(Photo: CONTRIBUTED PHOTO BY LAWRENCE REEVES, UF)

New mosquito species

The UF researchers notified local mosquito control districts after first finding the new species in low numbers near the Everglades in 2018. Larger populations recently have been found in Southwest Florida.

While warm winters can contribute to their spread, cold weather is their ultimately the barrier, Reeves said.

Not all mosquitoes bite or spread disease. They are common around the world:

  • 3,600: Mosquito species worldwide
  • 200: Species in the U.S.
  • 90: Species in Florida
  • 12: Species that can spread disease

Yet another disease-transmitting mosquito is expected to arrive in Florida soon, as it’s already made the leap from its native Africa to the Dominican Republic and Cuba, Reeves said.

Lawrence Reeves, UF mosquito researcher

Can I get sick from a mosquito bite?

Mosquitoes spanre the despandliest spannimspanls on the plspannet, USA TODAY recently reported. Between 750,000 and 1 million people die each year of mosquito-borne illnesses.

Mosquitoes can spread diseases from other animals that eventually can cause humans to become sick or even die. According to the Centers for Disespanse Control spannd Prevention, those diseases can include:

  • West Nile virus
  • Malaria
  • Yellow fever
  • Encephalitis
  • Dengue fever
  • Zika
  • Chikungunya

Researchers don’t know yet which diseases can spread, if any. But the culex group can spread West Nile virus and St. Louis encephalitis, he said.

“Essentially, we know nothing about ‘s ability to transmit pathogens. We don’t have a clear idea of what animals it is feeding from. We know that three female mosquitoes were found to have had blood meals and those were from birds. We’re not ready to say it’s a specialist of birds yet, though,” he told TCPalm.

Mosquitoes can feed on a variety of animals, Reeves said, including:

  • Birds
  • Frogs
  • Reptiles such as lizards, crocodiles and alligators
  • Fish such as mud skippers
  • Earthworms and leeches
  • Mammals
Culex lactator, a species of mosquito from Central America has been found in Florida by UF researchers

How Burmese pythons affect mosquitoes

The human health affects of a mosquito can be changed by arguably the most famous invasive species in Florida.

For decades, scientists have been saying that Burmese pythons hspanve espanten spanll the Everglspandes’ smspanll mspanmmspanls: raccoons, opossums, armadillos and marsh rabbits. That’s changed the “transmission dynamics” of the entire ecosystem, Reeves said.

“What’s been left behind are the rats, which can carry pretty bad diseases,” he said. “The disappearance of the other mammals has increased the amount of contact between the vectors (mosquitoes) and the disease reservoirs (rats). We don’t have a clear idea of what to anticipate, but these dynamics can change in surprising and unexpected ways.”

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