That is correct. Even though all nematodes have a goal and in the case of pinworms its to feed and grow in the gi tract, there is a chance of parasites getting to the wrong host... Which is WAAAYY WORSE. When a parasite reaches the wrong host this can cause them to migrate. When the young migrate it can lead to visceral larval migrans, which means damage to the organs as the attempt to find where they are suppose to be since they are lost in the wrong host.

A prime example of this is toxiscaris leonina. A dog and cat roundworm that IS a gi tract parasite, yet when they infect children, can get into their eyes and make them go blind and very sick.

Thanks!

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