Screwworm just crossed into Texas for the first time since 1966. The toolbox in 2026 looks nothing like it did 60 years ago, and the same idea behind the new drugs is showing up in a methane bolus from New Zealand.

Back in April we said the most important beef biosecurity story of the year was the sterile-fly facility breaking ground at Moore Air Base. We didn’t expect to be proven right this fast. On June 3, USDA-APHIS confirmed New World Screwworm in a three-week-old calf near La Pryor, in Zavala County, Texas. The first U.S. case in 60 years. Quarantine and movement restrictions are in place. There is no food-safety risk, but every cow-calf operator in the south now needs to know what’s in the cabinet, what works, and how you’d know if you had a case.

This week’s stories are connected by a single idea: the best cattle health technology of 2026 isn’t the strongest dose, it’s the one that keeps working long after you’ve shut the gate. In Simple Terms covers a New Zealand methane bolus that cuts emissions 75% from a single handling event and stays active for three months, a preview of where long-acting single-administration animal health is heading. The Deep Dive is the screwworm toolbox: every product cleared so far, how to choose between them, what no drug can do, and the new molecular test that finally turns a suspicion into a real case.

The short version of both stories: sit down with your vet before you need to.

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