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Some serovars of Escherichia coli, mainly O2 and O78, are responsible for air sac and systemic infections in farm-raised turkeys (Meleagris gallopavo) and chickens (Gallus gallus). We looked in air sac surface fluid from young turkeys to identify proteins that bind surface polysaccharides of pathogenic respiratory E. coli O2. Turkey air sac surface fluid was subjected to affinity chromatography on...