Fig. 2

Biofilm-forming capabilities of K. pneumoniae. All strains exhibited the strongest biofilm formation ability in LB broth supplemented with 50 μM iron, which was superior to the biofilm formation ability of the respective strains in LB broth containing 30 μM, 10 μM and 0 μM iron or 200 μM iron chelator +(−) 50 μM iron (P < 0.05). DP: 2,2′-Dipyridyl, added as an iron chelator. LB + 200 μM iron chelating agent group was used as control