This might be a stupid question but what is MAC? I've never heard of it before. And how do you treat it. The only thing my dr's have said I culture is MRSA- all the time- and psuedo- on occasion. I've been on IV meds a lot this past year too and my numbers still won't move much. I feel your pain<img src="i/expressions/face-icon-small-smile.gif" border="0">