system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't humans regularly de-wormed like pets are?

Wouldn't it make sense to do this just in case?
gpt
In industrialized nations, parasitic infections are rare. Between wearing shoes, not stepping in poop all the time, washing hands, cooking food thoroughly, and other changes of modernity, it's harder to get worms than it used to be.

In the rest of the world, people have parasitic worms, and that's a fact of life. Antiparasitic campaigns, which can include regular de-worming, have been attempted in the developing world with some success. Like any public health intervention, it comes down to risks and benefits--some parasites are pretty harmless, and antiparasitic medicines aren't always harmless (consider the rash of ivermectin overdoses in the U.S. recently.)

Interestingly, there's a fair case for RE-worming some humans. Our immune systems are well-adapted to having some worms on board and keeping them in check. In the modern world, a lack of parasites to help calibrate the system seems to be part of why allergies and autoimmune disease have increased dramatically in the West over a short period. Purposely giving people a relatively harmless worm, AKA helminth therapy, may be an effective treatment for autoimmune diseases like Crohn's and ulcerative colitis.