Published: 20:40, 4 June 2026

A parasitic fly called New World screwworm was found in a calf in Texas, USA. The larvae of these flies feed on the flesh of warm-blooded animals, including livestock, pets and wildlife. This phenomenon has caused concern among animal breeders and veterinarians. CNN reported the information on Thursday (June 4).
According to the report, this is the first time the parasitic flea has been identified in US cattle in decades. These infections can cause severe scarring and can be fatal if left untreated. The pest was eradicated from the United States decades ago through a coordinated sterile fly eradication program, but sporadic infestations still occur near the southern border.
USDA officials said the identification in Texas is under investigation and containment measures are being taken to prevent its spread. Farm owners are urged to check animals for wounds and contact a veterinarian immediately if infection is suspected.
USDA Secretary Brooke Rollins said, “We are preparing to take action the moment the fly enters our country. If its presence is detected domestically, USDA and relevant state animal health officials will immediately impose quarantine and movement restrictions to limit the spread of this harmful pest.”
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