Part of the elfADCG fimbrial operon, which could be required for adherence to host epithelial cells. ElfA is an accessory colonization factor that contributes to adherence of bacteria to human intestinal epithelial cells and to animal intestinal tissue in vitro. Binds specifically to laminin, but not to fibronectin or collagen type IV. Induced in the presence of epithelial cells. Mutants show significant reduction in adherence to several cultured epithelial cells (HEp-2, HT-29 and MDBK). Belongs to the fimbrial protein family.