Higher levels of Treponema vincentii in the oral microbiome were linked with lower psychopathy markers https://www.sciencealert.com/psychopathic-tendencies-are-linked-to-microbes-inside-your-body-study-reveals Gut and oral microbiota composition is associated with psychopathic personality: a cross-sectional study https://www.nature.com/articles/s41398-026-04052-z