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New World Screwworm Threatens Livestock — Update from Chief Meteorologist Mike LaPoint

New World screwworm is a dangerous fly whose larvae eat living tissue, posing a serious risk to livestock and wildlife. Officials warn that current conditions could allow outbreaks to recur. Livestock owners should watch for wounds, maggots, and changes in animal behavior and report suspicious cases promptly. Keep wounds treated and coordinate with veterinarians and local animal health authorities.

New World Screwworm Threatens Livestock — Update from Chief Meteorologist Mike LaPoint

New World screwworm is far more than a household nuisance — it poses a serious threat to livestock, wildlife and agricultural operations. Officials are warning that environmental conditions could allow a repeat of past outbreaks, and farmers and ranchers should stay alert.

What is the New World screwworm?

The New World screwworm (Cochliomyia hominivorax) is a species of fly whose larvae feed on living tissue of warm-blooded animals. Infestations can cause severe wounds, secondary infections, weight loss and even death if untreated. Historically, eradication campaigns using sterile-insect techniques eliminated the pest from large regions, but reappearances remain a serious concern.

Why officials are concerned now

Weather patterns and local conditions can create ideal breeding environments for screwworms. When officials say "history may be close to repeating itself," they mean that favorable conditions could allow localized populations to grow and spread if not detected and controlled quickly.

What livestock owners should watch for

  • Open wounds or areas where animals appear irritated or are frequently rubbing.
  • Visible maggots or flies concentrated around wounds, mouths, nostrils or hooves.
  • Unexplained weight loss, reduced appetite or lethargy.

Immediate steps to take

Keep wounds cleaned and treated, isolate affected animals, and consult your veterinarian promptly. Report suspected screwworm infestations to your state animal health agency or extension service so authorities can respond quickly. Maintain good pest-control practices and monitor animals regularly during warm, humid periods when flies are most active.

Chief Meteorologist Mike LaPoint provides this update to help livestock owners prepare and respond. Stay informed through local agricultural and public health advisories for the latest guidance.

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