* Roundworms (Ascaris lumbricoides): These are intestinal parasites that can cause a range of symptoms, including abdominal pain, nausea, and diarrhea. They are contracted through contaminated food or water.

* Head Lice (Pediculus humanus capitis): These tiny insects live on the scalp and feed on blood. They cause itching and can be spread through close contact with infected individuals.

These are just two examples, and there are many other types of human parasites.