We identified a broad correlation between the expression percentages of adhesion genes (fimH and iha), iron uptake systems (irp-2, feoB and fyuA), and protectins (traT) with the frequency of detection of the genes for sulfonamide (sul-2), beta-lactams (blaTEM), tetracycline (tet(A)), the MAR locus (marR-marO), and the frequency of detection of the gene encoding resistance to disinfectants (qacEA1) in gingivitis strains (p < 0.05; Table 3). Here, IREB2 is linked to gingivitis.