ACO1 and nosocomial infection: In this study, the correlation of the expression percentages of adhesion genes (mrkD and ycfM) and iron-acquisition systems (entB, irp-1, irp2, and fyuA) with the genotype of resistance to beta–lactam antibiotics (blaSHV, blaTEM, and blaCTXM-1), sulfonamide, and tetracycline was higher in K. pneumoniae strains isolated from patients with hospital-acquired infections compared with strains from community-acquired infections.