The Idaho State Department of Agriculture moved Wednesday to protect the state’s agricultural and pet animal populations, implementing stricter entry requirements following confirmed detections of New World screwworm in Texas and New Mexico.
The flesh-eating parasite, whose larvae burrow into and feed on living tissue of warm-blooded animals, was first confirmed in the United States on June 3. As of Wednesday, the U.S. Department of Agriculture had designated screwworm-infested zones only in southern Texas, but Idaho officials are not waiting for the infestation to spread before taking action.
New Entry Requirements for Animals Coming Into Idaho
Under the updated rules, all warm-blooded animals entering Idaho from screwworm-infested states must be accompanied by a Certificate of Veterinary Inspection issued no more than five days before the animal arrives in Idaho. Animals originating from officially designated screwworm-infested zones must also carry a movement permit from their state of origin.
The new requirements reflect how seriously Idaho’s agricultural leaders are treating the threat. Cattle and dairy production rank as the two largest sectors of the state’s agriculture industry, and a screwworm outbreak could cause severe economic damage to Idaho ranchers and dairy operators.
Department of Agriculture Director Chanel Tewalt said the state has been actively monitoring the situation and is ready to respond, noting that Idaho was well-positioned to act when the parasite reached the U.S.
Pet Owners Also Affected
The new requirements extend beyond livestock. Idaho officials are urging residents to avoid traveling with pets to screwworm-affected states. Pet owners who do return to Idaho from an affected state must obtain a health certificate from a licensed veterinarian in that state within five days of their return.
State Veterinarian Scott Leibsle highlighted the risk to household animals specifically, noting that “dogs and cats are just as susceptible to the pest as livestock, but pet owners may be less aware of the importance of thoroughly inspecting their pets for fly larvae that are very small and easy to miss.”
A Parasite With a History
New World screwworm is not an unfamiliar threat to U.S. agriculture officials. The USDA launched an eradication campaign against the parasite in the 1950s, ultimately achieving full eradication by 1986. Cases resurfaced in Florida in 2016, but a targeted response brought the outbreak under control by early 2017.
The current reappearance in Texas and New Mexico marks the first confirmed U.S. presence in nearly a decade, raising alarms for livestock-heavy states like Idaho that have significant economic exposure if the infestation spreads northward.
What Comes Next
Idaho agriculture officials will likely update requirements as the USDA expands or adjusts its list of designated infested zones. Livestock owners, ranchers, and pet owners planning travel to or animal shipments from southern states should monitor the Idaho State Department of Agriculture for any changes to entry requirements. Residents returning from affected regions with animals are strongly encouraged to consult a licensed veterinarian before re-entering Idaho.
For broader coverage of Idaho’s agricultural and business economy, visit Idaho News. More on Idaho’s Silver Valley economy, including the recent effort to restart local mining operations, can be found in coverage of the Sunshine Mine operator’s major stock offering.