Hi Sue, can you clarify "why" we don't take azithromycin" by itself. My understanding is that alone it is the most important drug to have for mycobacterium, but it is also the most important antibiotic to have available for "crisis infections" that could come down the road. They give the other 2 antibiotics (rifampin and erythromycin) to keep our bodies from building up a resistance to the azithromycin so that it can be useful for the longest possible time. Is this right?