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New World screwworm cases are resurging in the US, with more than 40 confirmed in November, already the worst month since the pest first appeared in Texas. The parasite has spread to Arizona and there are nearly 130 US cases in total, with more than 60 active.
Milder temperatures and humidity are favoring the parasite's activity.
Screwworm losses and movement restrictions reduce the available US cattle supply and raise the risk of further tightening, which supports cattle prices and raises feed demand from herds that are kept longer.
insurancejournal.comIlena Peng, Lauren RosenthalNov 12, 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.
After 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.
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.
