The ability of reovirus to attach to cells pretreated with Ultra Dry 100 Q extract was tested. The results are represented as (A) the 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 —□— (Ultra Dry 100 Q extract = 0 mg/ml), ----△---- (Ultra Dry 100 Q extract = 0.1 mg/ml), ---○--- (Ultra Dry 100 Q extract = 0.01 mg/ml), ---□---- (Ultra Dry 100 Q extract = 0.001 mg/ml), —△— (Ultra Dry 100 Q extract = 0.0001 mg/ml), —○— (Ultra Dry 100 Q extract = 0.00001 mg/ml). These data are new but generated by repeating experiments previously published [47]. The experiments were repeated and the data are included to permit a direct comparison to the new data presented for both reovirus and rotavirus in Figures 3 -7. PFU: Plaque-forming unit.