question: I am suffering from low grade fever with positive mantoux having 20x18mm dimensions and having all other testings to be normal. I had gone for the tests which are x-rays of chest and dorsal lumber spine,ultrasound of stomach, typhiod, jaundice, malaria, tb, urine, blood test but all are negative and I had gone to doctor amd m still going but not having a clear image of disease that what disease m having