my daughter and I thought we had threadworms (itch around front and back passage, cloudy urine, frequent stools) and have taken medicine (this was a week ago). I have followed all the instructions re cleaning and personal hygiene. However, our stools were rather frequent and loose again today and she is still itchy. How do we know the worms have gone? Can we only recontract the worms by ingesting eggs, or can the cycle carry on through eggs hatching, maturing and laying eggs all within the body?