
A historical feature recalls the screwworm parasite's devastation of Southern livestock in the late 1940s through 1960s. It describes how infested animals died and how ranchers had to treat them daily.
The article is background only, with no new outbreak or policy change affecting current supply or prices.
After 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.