It's been awhile since I have been on to given an update on my son. He is doing well and finished a year of plasma exchange treatments in July 2015. His energy levels are much better but he is still on supplements and medications. He has not had any strep infections and still takes penicillin VK 250 mg daily. In addition to his supplements and medications, he also takes the 90 billion Ultimate Flora probiotic for men. My son is 17. He was 13 years old when the Cunningham Panel test was run and antibodies were found in December 2013. He started treatment with high dose antibiotics, then IVIG, and then went on to Plasma Exchange. My son has been on antibiotics since December 2013. What I am wondering about is how long is too long to stay on antibiotics? I am afraid he could have a relapse if taken off. His doctor wants to leave him on the antibiotics because of a possible relapse. Are any of you dealing with this situation? Would love to know your opinions.