Worms are mainly spread in small bits of poo from people with a worm infection. Some are caught from food. You can get infected by: . You can catch some worms .
How common are worms in humans?
Pinworms. It's estimated that more than 1 billion people in the world are infected with pinworms, and they're the most common type of worm that infects humans in North America. Children are most commonly infected. They're easily passed between people living in close quarters.
Do normal humans have worms?
Humans are the only host of threadworms. The adult worms live in the lower intestine, coming out of the anus at night to lay their eggs. Children with threadworms can get the eggs under their fingernails when scratching their itchy bottoms at night.
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