Back to today’s briefing

Story perspectives

New World Screwworm Returns, Threatening U.S. Livestock

5/5/2025

28 4

Summary

Story summary

The resurgence of the New World screwworm, a perilous parasite once eradicated in 1966, poses a grave threat to U.S. livestock and wildlife. With 950 cases reported in Mexico this year, the USDA is contemplating the revival of sterile male production to stave off potential outbreaks, as experts caution about dire economic losses and serious animal health risks.

1 of 1

Story summary

The resurgence of the New World screwworm, a perilous parasite once eradicated in 1966, poses a grave threat to U.S. livestock and wildlife. With 950 cases reported in Mexico this year, the USDA is contemplating the revival of sterile male production to stave off potential outbreaks, as experts caution about dire economic losses and serious animal health risks.