I'm in more of a rural area.
We have several dogs and a cat. I worm them often, but they hate the HumaWorm I bought them, no matter what I mix it with. I stay as far away from our pets as possible, so I won't get anymore infested than I already am. My husband takes care of the pets, and they sleep in the bed with him-I sleep in another room-again, to avoid more infestation.
I'm sure that the pets are a big cause of my parasites, but I also believe that I have had them since I was a child.