Oral cavity and gut are important parts of the human digestive tract. The structure and pathogenesis of oral and gut microbial communities have been extensively investigated. The interaction and pathogenic effects of oral and gut microbiota have also been widely explored. This review aimed to integrate data from literature and discuss the structures and functions of microbial communities in the oral cavity and gut. The mutual colonization and pathogenesis of oral and gut microbes and the relationship between these phenomena and involved systemic diseases are also described.
口腔和肠道是人体消化道的重要组成部分。口腔微生物和肠道微生物的相互关系和致病共性已成为近年来人体微生物组研究的热点。本文结合近期研究进展，对口腔微生物和肠道微生物群落结构和功能，相互定植和致病作用，以及两者与系统性疾病的相关性进行综述。.
Keywords: gut; microbiome; oral cavity; systemic diseases.