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More than 40 New World screwworm cases were confirmed in the US in early November, the worst month since the parasite reached Texas in June, according to the USDA. Nearly 130 cases have been recorded nationwide, with more than 60 active, and the pest spread to Arizona in October.
Over 65,000 cattle have crossed from Mexico since imports resumed in late August.
Rising infestations raise the risk of movement restrictions and tighter US cattle supply, which supports live and feeder cattle prices. Mild weather is cited as the driver, so the outbreak could persist into winter.
businessbearings.comDaniel OkaforNov 13, 2026After 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.
