The polymeric stability of the Escherichia coli F4 (K88) fimbriae enhances its mucosal immunogenicity following oral immunization., Verdonck, Frank, Joensuu Jussi Joonas, Stuyven Edith, De Meyer Julie, Muilu Mikko, Pirhonen Minna, Goddeeris Bruno Maria, Mast Jan, Niklander-Teeri Viola, and Cox Eric , Vaccine, 2008 Oct 23, Volume 26, Issue 45, p.5728-35, (2008)