This episode is all about saliva: how certain bacteria survive in it, and how swallowing saliva might cause intestinal inflammation. Links for this episode: Genes for the Streptococcus pyogenes fitness in human saliva (mSphere) Swallowed bacteria drive colonic inflammation (Science) Intestinal inflammation induced by oral bacteria (Science) Human oral microbiome (J Bact) T cell subsets (Nat Rev Imm) Image credit