Sorry to disappoint, but being a vegetarian does not mean that you cannot get parasites. My parents are in central america, and are well versed in the nasty creatures you can pick up from fruits and veggies...especially things like Lettuce, celery, cucumbers...anything fruit/veg with a high water content. (Though their experiences are a little more extreme than what we may encounter)From what I have read, having pets, walking in bare feet, amongst other things also put us at risk of picking up parasites.
I'm also new to cleansing, and initially wanted to do the liver cleanse, but after reading through the information available, decided to backtrack and do the parasite cleanse first.