Mycobacterium intracellulare is a type of bacteria that belongs to the Mycobacterium genus. It is commonly found in the environment, particularly in water and soil. This bacterium is known for causing infections, especially in individuals with weakened immune systems, such as those with HIV/AIDS or other chronic illnesses. Infections caused by Mycobacterium intracellulare can lead to respiratory issues and other health problems. It is often associated with a group of diseases known as nontuberculous mycobacterial infections. Diagnosis typically involves laboratory tests, and treatment usually requires a combination of antibiotics over an extended period.