Mycobacterium avium complex (MAC) is a
group of bacteria, commonly found in soil or water, that can infect people who
have acquired immunodeficiency disease (AIDS). In people whose CD4+ cell count drops below 50 cells per
microliter (mcL), the bacteria can spread throughout the body and cause
infection almost anywhere.
There is no easy way to avoid exposure to Mycobacterium avium complex bacteria. But medicines are
available that can prevent disease.
How this information was developed to help you make better health decisions.