 The colonies are small and greyish, they produce a greenish discoloration of the underlying agar, and smell faintly of bleach (hypochlorite).They are oxidase-positive, catalase-negative, urease-negative, and indole-negative, and reduce nitrate to nitrite.In 2006, Azakami "et al" reported that the periodontal pathogen "E. corrodens" have ortholog of "luxS", the gene required for quorum sensing (QS) signal molecule AI-2 synthesis and "E. corrodens" can produce AI-2 signal for cell-to-cell communication and AI-2 has a role on biofilm formation by "E. corrodens".