Why does a person become infected with roundworms more often than flat parasitic worms?

For roundworms, the direct path to the human body occurs through unwashed berries, fruits, non-observance of the rules of hygiene, i.e., the path of roundworms to the human body is much faster than flatworms, for which there are their own objects of parasitism – the main hosts are cows, pigs, etc.

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