Gene content profiles of enteropathogenic (EPEC) and commensal strains. This enrichment analysis includes 6 additional genomes, 5 commensals and 1 EPEC, downloaded from Genbank (Table 3). Enrichment analysis was carried out following criteria VI (Table 2). 86 genes (p < 0.01) were found to be enriched in the pathogenic group while only 3 genes (p = 0.35) were enriched in the commensal group. The complete distributions of possible gene enrichments are presented in Additional file 1: Figure S9.