I took my metametrix report, saying PPTU ( parasite present taxonomy unknown) to an infectious disease doctor a year or 2 ago.. He was very impressed with the extensive detailed test of Metametrix!!!!!!!!! He truly was amazed which surprised me because he was so open to the test!!!! But in the end, he told me to forget about the PPTU. He said we all have bugs in us, and that if he took the test, it would come up with bugs in him!!!!!!!! He said leave alone, and the fact that I had a hemmoroidectomy in 1997, and an anal fissure, that those would cause the itching. So, he said leave alone. so, that was his opinion.