There are many strains of mycobacterium. TB is one, but there are others. Some are less virulent in people.
Avium is one. Mycobacterium chelonae is another that lives in soil and tap water. This one infects sinuses (people who do neti pots and do not use sterilized water) and also causes surgical infections, and abscesses.
All the mycobacteria, have difficult cell walls, and are hard to eradicate. TB is just one that infects humans more virulently.
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Weezie looking at petunias 8.25.2017
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