@Cathln...Losing a child suddenly makes you very vulnerable to infection. It's a whole body reaction. I hope you will insist your doctor check sputum more often. I am sorry to hear about your struggle. I lost my son 45 years ago. It still hurts. There were no grief support groups then in our area, but there are now. I hope you will seek out a support group in your area. If you are not able to do so, there is a coping.org site online with evidence-based suggestions to help you. I can answer one question for you. MAC is not always treated. It depends on your specific lung problems. I hope you will hear from other members of this group. They have been very helpful.