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A Congressional Research Service primer explains New World screwworm, a parasite that lays eggs in wounds of warm-blooded animals and destroys living tissue. USDA eradicated it from the U.S. in 1966, and recent Mexican cases have raised domestic concerns.
A 1976 Texas outbreak was estimated to cost $732 million to livestock producers.
The background on outbreak risk and historical losses underpins why the cattle import closure and tight supplies continue to support livestock prices.
everycrsreport.comJun 2, 2025After 356 past disease events, Live Cattle moved a median +0.2% over 5 sessions (54% higher; middle half -0.8% to +1.1%), and +1.1% over 20.
After 266 past disease events, Feeder Cattle moved a median +0.5% over 5 sessions (59% higher; middle half -1.1% to +1.7%), and +1.7% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
