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Enterococci are opportunistic pathogens that can form biofilms during infections and many virulence determinants are involved in this process. Although the virulence factors are often analysed in  Enterococcus  spp. from humans and food animals, little is known about gut enterococcal isolates from wild birds. Therefore, the determination of virulence factors among enterococci isolated from wild birds may provide new information about a possible source of infection for humans and animals or vice versa via the environment. We analysed different phenotypic and genotypic traits in enterococci from wild birds related to potential virulence in humans and animals and to evaluate biofilm formation and its relationship to virulence genes. The  E. faecalis  isolates were characterised by greater frequency of biofilm formation in BHI than  E. faecium . There was a correlation between hydrophobicity and biofilm formation in BHI broth in  E. faecalis . None of the isolates was haemolytic. The presence of some adhesion and gelatinase genes was detected in biofilm-positive isolates. The enterococcal pathogenic factors ( esp ,  hyl , and  cyl  operon genes) did not seem to be necessary or sufficient for production of biofilm by analysed bacteria.  Enterococcus  species isolated from wild birds should be considered as a possible source of some virulence determinants.

Biofilm formation capacity and presence of virulence factors among commensal Enterococcus spp. from wild birds