Federal animal health officials have confirmed the first U.S. case of New World screwworm in decades, triggering an aggressive response effort in South Texas and adding new uncertainty to already volatile cattle markets.
The U.S. Department of Agriculture’s Animal and Plant Health Inspection Service confirmed Wednesday that New World screwworm larvae were found in a 3-week-old calf in Zavala County, Texas. The larvae were identified in the animal’s umbilical area.
To date, officials said no additional cases have been detected.
USDA and Texas animal health officials are taking immediate action to contain and eradicate the pest. Response measures include establishing a 20-kilometer quarantine zone around the detection site, increasing surveillance and trapping efforts, deploying response personnel and accelerating the release of sterile screwworm flies in the area.
Federal officials noted that approximately 4 million sterile flies per week were already being released aerially in the region. Additional ground-based releases are now being deployed as part of the response.
The confirmation comes amid growing concern over the parasite’s movement north through Mexico.
Market analysts said fears surrounding New World screwworm have already had a significant impact on cattle futures, even as cash cattle prices remain near record highs.
“It’s close now,” Brad Kooima, a market analyst with KKV Trading told the Rural Radio Network ahead of the confirmation. “Last week there were 22 reported cases within 100 miles of the border. I don’t think anybody — most of us, I guess I should say, me at least — is thinking there’s any way you’re going to keep it out when it’s that close.”
Kooima said New World screwworm has dominated market conversations in recent days, contributing to a disconnect between futures prices and the cash cattle market.
“I think we’ve been dealing with screwworm almost exclusively for the last three days in our futures market,” he said. “The whole trade is worn out with all this stuff. Stay tuned. Fasten your seatbelt. It’s one day to the next.”
The reaction has been particularly noticeable in feeder cattle futures, where traders have worried about potential movement restrictions or disruptions tied to a confirmed infestation.
Not all analysts believe the long-term market impact will be as severe as the initial reaction suggests.
“We have really blown this out of proportion,” said David Ericson of Ag Optimus.
Ericson noted that cash cattle trade has remained largely steady despite the headlines and suggested the market could eventually refocus on tight cattle supplies.
“Will it really matter, or will it be a buy-the-fact, sell-the-rumor type of situation?” he said.
Kooima said the pest is treatable and believes the market will eventually move beyond the uncertainty surrounding the detection.
“This is treatable,” Kooima said. “Part of me is like, let’s get it in the market. Let’s figure out that we’re going to treat it and let’s get on down the road and go back to normal.”
Despite the volatility in futures contracts, cash cattle prices remain historically strong. Kooima noted negotiated cash trade in parts of the Plains reached $257 per hundredweight last week, just below recent record levels.
“We’re going to find out that we still don’t have enough cattle to go around,” he said. “I still think you’ve got a shot at having a very strong cash market for the balance of June.”
New World screwworm is a flesh-eating parasite whose larvae burrow into the living tissue of warm-blooded animals, including cattle, wildlife, pets and, in rare cases, humans. The pest was eradicated from the United States decades ago through a sterile fly release program but has steadily advanced northward through Central America and Mexico over the past year.
USDA is urging livestock owners and pet owners in the affected area to monitor animals for draining or enlarging wounds, signs of discomfort, or the presence of larvae. Officials emphasized that the U.S. food supply remains safe and that screwworm does not infest meat or other food products.