Salynn, Thank you for this helpful explanation about anemia. I have a low red blood cell count. (I have been on the Big Three antibiotics for 2 months following a MAC diagnosis.) Back in the Spring I had several iron infusions because of anemia and I've been wondering why these infusions didn't do more to elevate the red blood count. But your explanation makes a lot of sense. My red blood count isn't low enough to alarm my doctor, but she wants to check it again in 6-8 weeks.