
USDA's Animal and Plant Health Inspection Service has confirmed 116 New World screwworm infestations in Texas, New Mexico and Arizona as of November 5, 2026, with 56 still active. Most cases involve cattle, horses, sheep and pets, and two wildlife cases in elk have been confirmed in Texas.
It is the first detection across three mainland states since the late 1970s.
Spread of the parasite threatens US cattle health and can restrict animal movements and trade, tightening cattle supplies and supporting cattle prices. The outbreak also reinforces the case for keeping the Mexican border closed, which limits feeder cattle supply.
After 150 past bullish disease events, Live Cattle moved a median +0.4% over 5 sessions (63% 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.