The antiviral potency of soluble intercellular adhesion molecule-1 (IDAM-1; the major receptor for human rhinoviruses) was determined for a subset of American Type Culture Collection reference serotypes and held isolates of rhinovirus. The results indicate that soluble ICAM-1 exhibits a broad spectrum of activity against rhinoviruses and that field isolates have a sensitivity indistinguishable from that of laboratory strains.