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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