In the L. hongkongensis genome, a putative adhesin (LHK_01901) for colonization of the intestinal mucosa, most closely related to the adhesins of diffusely adherent E. coli (DAEC) and enterotoxigenic E. coli (ETEC), encoded by aidA and tibA respectively, was observed ( Figure S4 ) [30, 31] . aidA and tibA encode proteins of the autotransporter family, type V protein secretion system of Gramnegative bacteria. All the three domains (an N-terminal signal sequence, a passenger domain and a translocation domain) present in proteins of this family are found in the putative adhesin in L. hongkongensis.