@gopwatch.daily: The first New World Screwworm case in 45 years just showed up in a three-week-old calf in La Pryor, Texas. Brooke Rollins says they were ready. Quarantine is active. Sterile fly releases are underway. Surveillance is moving. The Darien Gap, the biological barrier that kept this parasite out of the U.S. since the 1960s, has been compromised. That's the part of this story that matters. Screwworm larvae eat living tissue. They can kill a calf in days. If this spreads to the broader livestock population, the damage is enormous. One confirmed case doesn't mean a crisis yet. But one confirmed case is exactly how these things start. How fast they contain this will tell you everything about whether the response is actually as ready as they say it is. #screwworm #livestockdisease #brookerollins #agriculture #uspolitics