HI, My daughter had a strep infection back in December and another one in January. She never recovered and has a constant head-ache and stomach ache since then. She has also gotten sick frequently (a sinus infection, a rash, high fevers with viruses) but really no diagnosis. She has been on numerous antibiotics and just recently had another ASO Titer test and it was higher than her last! It was 591 in March, 515 in April, and now after being on antibiotics for 1 month, it is up to 552. She hasn't tested positive for strep for almost 6 months so I would expect to see her Titer levels going down at this point. Any ideas? She has had numerous blood tests, xrays, ct scans. The only other thing that has shown up is that her lymph nodes in her abdomen were slightly enlarged and they did a biopsy that showed enterbacter and she was put on a sulfa drug for that. Basically, she has had a stomach ache and head ache for 6 months and tires easily and no one has any answers.