“…Fl fimbriae, which are characterized by their ability to bind to D-mannosides, are commonly expressed by many E. coli strains (8,31,35). Several studies in which polyclonal antisera or monoclonal antibodies were used have demonstrated an immunological heterogeneity among the Fl fimbriae from E. coli (8,13,31,35,36,41). Jayappa et al (14) have suggested that Fl fimbriae from E. coli strains isolated from humans consisted of at least 12 different serotypes, whereas those isolated from ETEC strains from pigs belonged to only one serotype.…”