Nontuberculous mycobacteria (
NTM), also known as
environmental mycobacteria,
atypical mycobacteria and
mycobacteria other than tuberculosis (
MOTT), are
mycobacteria which do not cause
tuberculosis or
leprosy (also known as Hansen's disease). NTM do cause pulmonary diseases that resemble tuberculosis.
Mycobacteriosis is any of these illnesses, usually meant to exclude tuberculosis. They occur in many animals, including humans.