this post was submitted on 02 Jun 2025
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New World Screwworm, a devastating parasite that eats cattle and other wild animals alive, is traveling north from Central America to Mexico and has crept past biological barriers that kept the pest contained for decades, experts said.

Washington halted cattle imports from Mexico in May, citing the insect’s spread further into Mexico, about 700 miles from the Texas border. With the U.S. cattle herd already at a multi-decade low, the closure could further elevate record-high beef prices by keeping more calves out of the U.S. cattle supply.

When screwworms infect a cow, a tiny scrape, a recent brand or a healing ear tag can quickly become a gaping wound, carpeted with wriggling maggots that put the entire herd at risk of infestation. Screwworms were eradicated from the U.S. in the 1960s when researchers began releasing massive numbers of sterilized male screwworm flies who mate with wild female screwworms to produce infertile eggs.

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[–] Aidinthel@reddthat.com 19 points 1 week ago (2 children)

This is really bad. The US should have put in the funds to exterminate this thing while we still had a functioning government. I dislike the article's focus on prices as the main consequence here. Screwworms are fucking horrifying, and they can affect humans, too.

[–] HellsBelle@sh.itjust.works 7 points 1 week ago (1 children)

They did. It's in the article and the summary above.

Screwworms were eradicated from the U.S. in the 1960s when researchers began releasing massive numbers of sterilized male screwworm flies who mate with wild female screwworms to produce infertile eggs.

[–] Aidinthel@reddthat.com 0 points 1 week ago (1 children)

Eradication =/= extermination. The latter means zero left alive on the whole planet. The fact that the US stopped at clearing screworms from only North America while leaving them alive in the south (and Cuba) always left the possibility of this happening.

[–] HellsBelle@sh.itjust.works 1 points 1 week ago

Both of those words are used synonymously. Never mind you have to take into account that eradicating screwworms for 60+ years was about as good as it could get ... especially considering that in the 60s nobody knew about global warming and the migratory effect it would have on pests and diseases.

[–] SaltSong@startrek.website 3 points 1 week ago

I dislike the article’s focus on prices as the main consequence here. Screwworms are fucking horrifying, and they can affect humans, too.

I imagine they remember the far off year of 2021, where the threat of drowning in you own lungs was not considered sufficient reason for a great many people to give a shit.

Expensive burgers may be the lever needed to get people to pay attention.

[–] circuitfarmer@lemmy.sdf.org 8 points 1 week ago

In case anyone is curious what a screwworm infection can do to, say, a human...

These things are terrifying. Watch at your own peril.

https://youtu.be/kWMaYCiudsY

[–] njm1314@lemmy.world 4 points 1 week ago (1 children)
[–] Cosmonauticus@lemmy.world 3 points 1 week ago

I can barely afford to pay attention

[–] WrenFeathers@lemmy.world 3 points 1 week ago

Big Screwworm is at it again I see.

[–] SynopsisTantilize@lemm.ee 3 points 1 week ago (1 children)

Wait, I thought we have been eradicating them since the 1960s? Like Ultra mega genocidal eradication.

[–] HellsBelle@sh.itjust.works 2 points 1 week ago (1 children)

You did. Then global warming happened and the screwworm flies have been migrating north.

[–] SynopsisTantilize@lemm.ee 3 points 1 week ago

Yay. I love good news!

[–] wanderwisley@lemm.ee 2 points 1 week ago

Make beef great again.

[–] brrt@sh.itjust.works 2 points 1 week ago (1 children)

Just watched the Kurzgesagt video that dropped today. It seems it was on point.

[–] HellsBelle@sh.itjust.works 1 points 1 week ago

Cool video. Thanks!

For those who want to watch ... https://m.youtube.com/watch?v=zxq60I5RSW8