1 rich Libsyn https://www.libsyn.com 90 600 TWiM explains how a mutualistic model bacterium can become lethal in a non-symbiotic host, and engineering a kill switch into a tuberculosis vaccine for improved safety. Hosts: Vincent Racaniello, Michael Schmidt, Petra Levin and Michele Swanson. Subscribe to TWiM (free) on Apple Podcasts, Spotify, Android, RSS, or by email. Become a patron of TWiM. Music used on TWiM is composed and performed by Ronald Jenkees and used with permission. Links for this episode When a mutualist becomes lethal (mBio) A lasting symbiosis (Nat Rev Micro) A kill switch for BCG (Nat Micro) Engineering mycobacteria for vaccination (Nat Micro) Take the TWiM Listener survey! Send your microbiology questions and&amp;nbsp;comments (email or recorded audio) to twim@microbe.tv This Week in Microbiology http://www.asm.org/twim/ <iframe title="Libsyn Player" style="border: none" src="//html5-player.libsyn.com/embed/episode/id/36899440/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/a53939/" height="90" width="600" scrolling="no" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe> https://assets.libsyn.com/secure/item/36899440