A 5 year old female was seen in a community clinic after "vomiting a worm". This frightening experience included recent bouts of fever, symptoms of asthma, and abdominal pain. The girl and her family were also recent immigrants of a developing country where human feces is used as fertlilizer, and where there is no plumbing and outdoor defecation is common.

How does one become infected with this parasite?

A. Vector transmission
B. Stagnant water
C. Contaminated soil and water or fecal-oral route
D. Skin penetration