M. vaccae is an fascinating example of beneficial bacteria found in soil! I think you can simply breathe it in from being around soil, but don't quote me on that<p><a href="https://en.m.wikipedia.org/wiki/Mycobacterium_vaccae" rel="nofollow">https://en.m.wikipedia.org/wiki/Mycobacterium_vaccae</a><p><a href="https://www.google.com/search?q=m+vaccae" rel="nofollow">https://www.google.com/search?q=m+vaccae</a>