The ability rotavirus to attach to cells pretreated with Vax Sap was tested. The results are represented as the (A) number of virus PFUs, (B) percentage of total added virus, (C) the amount of radioisotope labeled virus and (D) the percentage of radiolabeled virus bound to the cell monolayers (1 × 106 cells) within 1 h. See materials and methods for details. The data are plotted as —□— (Vax Sap extract = 0 mg/ml), ----△---- (Vax Sap extract = 0.1 mg/ml), ---○--- (Vax Sap extract = 0.01 mg/ml), ----□---- (Vax Sap extract = 0.001 mg/ml), —△— (Vax Sap extract = 0.0001 mg/ml), —○— (Vax Sap extract = 0.00001 mg/ml). PFU: Plaque-forming unit.