compared genomes from the bee gut Bartonella species and identified 26 unique genes in strain W8125T. These genes were found to be enriched in 10 Gene Ontology clusters, with one cluster related to pathogenesis, specifically containing genes encoding invasin. The search for invasin genes in all Bartonella species revealed that only strains W8125T, BBC0122, and B10834H15 of B. choladocola contained these genes. Invasin is an outer membrane protein that facilitates bacterial entry into host cells by binding to host cell integrins. Notably, B. choladocola strains had multiple copies of invasin genes, which formed a distinct group in phylogenetic analysis. Additionally, some copies of invasin genes in B. choladocola were found in close proximity to genes encoding heme-related factors, which are known virulence factors in Bartonella species. These findings suggest that the presence of invasin and hemin-related genes may help B. choladocola invade the intestinal barrier, allowing it to potentially exist as both a gut symbiont and an erythrocytic pathogen with enhanced invasion capacity. However, further investigation is needed to confirm these theoretical findings.