Miriam,
Attached is the guidelines of the America Thoracic Society and others on diagnostic criteria for whether or not to treat MAC patients with the Big 3. Just because your sputum tests positive for MAC does not mean you need to get on the Big 3. What's important to look at also is the colony count. Make sure the lab you use does colony counts because if the count is low enough, your doctor probably won't put you on the antibiotics.
lora jo