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this post was submitted on 04 Jun 2026
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When something is eradicated, but comes back, how does that work? Was it only eradicated because of ongoing efforts from this agency?
Basically. We had previously driven the screw worm south of the darian gap and we had been keeping it there by continuously dropping sterile flys across the region to prevent them from breeding. But the mitigation measures were cut to save money so now we're back to having screw worm in the US.
This comment needs to be at the top. This was an intentional choice made in the first trump administration to just…stop doing the cheap thing that had been working for a generation. Now the exact expected outcome has come to fruition.
And to generalize it more, pests and diseases are rarely truly eradicated, that's part of why smallpox is so notable, the virus only exists in laboratory settings anymore (and that's partly because it's a predominantly human disease). Usually eradication means in an area or in people in an area. Because of that it's usually an active effort to keep it out. Measles was eliminated in the developed world, but it was still around, it was just kept at bay by mass vaccination. As vaccination rates fell it was able to come back through interactions with places it hadn't been eliminated.
It was pushed out of North America by releasing large amounts of sterile flies, so that they'd mate and die without producing new generations. They pushed the range of the fly down slowly, until they hit Panama.
That is a very narrow strip of land connecting North and South America, allowing for a 'wall' of sorts to be made, by continually releasing batches of the sterile flies from sites in the area.
With Covid disruptions, and associated cuts to the department though, they've been creeping past the barrier, and there wasn't a funding increase to push them back down. DOGE accelerated this by firing a bunch of the people involved.
Interesting, thanks for the answer!
It was stuck in South America, and eradicated from North America, with the Darian Gap as the barrier IIRC.
But it’s been spreading north since like 2023. There’s been a kind of inescapable dread that it would come to the US eventually, but it happened faster than was expected.
Because the Republicans ended the program that kept them away
the new world screworm was eradicated in NA up until 2023, when the program ended due to covid disrupting things.