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The New World screwworm spread from Panama through Mexico and into the United States after sterile-fly production failed to keep pace with the outbreak. Mexico and Panama now produce about 150 million sterile flies a week, well below the 500 million weekly used during the 1960s eradication campaign; the shortage contributed to a US closure of the Mexican cattle border starting in May 2025, and cases have since been confirmed in US cattle.
Screwworm cases and cattle-import restrictions can reduce the supply of cattle available to US buyers and disrupt cross-border flows, supporting US cattle prices. Continued limits on sterile-fly capacity raise the risk of further disruption.
internazionale.itRedazioneNov 9, 2026
straitstimes.comNov 9, 2026After 122 past bullish disease events, Feeder Cattle moved a median +0.4% over 5 sessions (60% higher; middle half -1.0% to +1.6%), and +2.0% over 20.
After 148 past bullish disease events, Live Cattle moved a median +0.4% over 5 sessions (62% higher; middle half -0.5% to +1.2%), and +1.4% 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.
