Germs, like plants and animals, have been classified into similar groups. The groups are called "families." One such family of germs is known as the Mycobacteriaceae. Within this family there are a number of species. Some species can cause human diseases (pathogenic). Others species do not cause human diseases (saprophytic). Mycobacterium tuberculosis is an infamous species. This is the organism that causes human tuberculosis.
Click to open: Nontuberculous Mycobacteria (NTM)