Why? Animals are at a much higher risk of parasites than humans. Humans, outside of specific environments, aren’t usually at risk. In the developed world, pin worms are the most common, but it is usually self-limiting and even then not as widespread as to warrant prophylactic treatment. Pets are usually given prevention for heartworms, which is not a concern for humans.
Most people don’t eat other animal’s poop or dirt or dead rodents and stuff. Most people don’t walk around in the forest or wherever and then spend the rest of the afternoon licking their feet.
To get many parasites, you need to ingest their eggs, basically. Parasite eggs are present in the excrement of other animals that have parasites. If you avoid eating that, like by washing your food carefully, you don’t need to worry about it
Some parasites also might be present in some animal’s meat, but if you thoroughly cook it it will kill them, so again, no need to worry about it for most people. If you’re regularly consuming undercooked pork or ground beef there might be a risk
Worms generally make it into pets by them consuming prey that are not domesticated, such as mice, rabbits, or birds (living or dead). Generally whatever we feed them is processed and safe, but what they consume this way doesn’t have that same safety net. *Add to that*, humans tend to prefer their meat cooked.
The short answer is that the worm poison is bad for your body.
Having worm is in some way even beneficial for you body since your immune system has evolved to be exposed to some worms. Haven worms is associated with lower risks of allergy and there are even treatments where you on purpose expose a person to worm antigens, to trigger a response of the immune system.
So there is no point of profylakse treatment of worm, but you do it if the worm infection is present and doesn’t clear itself.
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