by La Jolla Institute for Immunology Scanning electron micrograph of Mycobacterium tuberculosis bacteria, which cause TB. Credit: NIAID Everyone breathes in Mycobacterium avium complex (MAC) bacteria from time to time, but most people don’t get sick. These bacteria, cousins of the deadly Mycobacterium tuberculosis, tend to live out their harmless little lives in food, soil, water, or...
