The concentrations (pg/ml) of IL-8 induced by different C. concisus strains at a multiplicity of infection (MOI) of 100 were 133±31 for P1CDO2, 276±20 for P1CDO3, 274±9 for PACDO1, 171±19 for P1CDB1, 148±9 for PBUCO1, 234±26 for P3UCO6, 244±14 for P3UCB2, 344±16 for P3UCLW2, 130±11 for P2CDO4, 238±23 for H2O1, 243±36 for H3O1, 229±43 for H4O1, 229±13 for H5O1 and 288±30 for H6O1 (Figure 8 A). This evidence concerns the gene CXCL8 and infection.