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Most Escherichia coli isolates can express type 1 fimbriae with mannose- specific adhesins. These adhesins bind to the oligosaccharide chains of secretory immunoglobulin A (IgA). Thus, in addition to specific antibody activity, secretory IgA possesses a broad reactivity with bacteria expressing type I fimbriae. The absence of secretory IgA in colonic secretions, as seen in IgA deficiency, might th
