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Diabetic foot ulcers (DFU) are exacerbated by bacterial colonisation. Here, a high prevalence of  Enterococcus faecalis  was observed in DFU patients from an Argentinean hospital.  E. faecalis  was frequently co-isolated with  Escherichia coli ,  Morganella morganii , and  Pseudomonas aeruginosa . The effect of interspecies interactions on bacterial growth was investigated in mixed-species macrocolony biofilms developed in Lubbock-Glc-agar. Similar cell counts were found for  E. faecalis  and  M. morganii  growing in mixed and single-species biofilms. An  E. faecalis  strain showed 1 Log higher cell counts in mixed biofilms with  E. coli . Remarkably,  E. faecalis  strains showed 2 to 4 Log higher cell counts in mixed biofilms with  P. aeruginosa . This effect was not observed in planktonic growth or biofilms developed in tryptic soy agar. The present findings reveal bacterial interactions that benefit  E. faecalis  in mixed-species biofilms, mainly with  P. aeruginosa , in a medium that partially mimics the nutrients found in DFU.

biofouling

Interspecies interactions in mixed-species biofilms formed by  Enterococcus faecalis  and gram-negative bacteria isolated from polymicrobial diabetic foot ulcers