RSV604 (5 days) inhibits the growth of four laboratory strains of RSV (RSS, Long, A2 and B), with EC50s ranging from 0.5 to 0.9 μM in plaque reduction assay.
RSV604 (6 days) inhibits RSV-induced HEp-2 cell death, with an EC50 of 0.86 μM.
RSV604 (3 days) reduces viral antigen synthesis in RSV-infected HEp-2 cells, with an EC50 of 1.7 μM.
RSV604 (1-20 μM; 7 days) dose-dependently inhibits RSV infection in human airway epithelial (HAE) cells, with no gross cytotoxicity, leakage of basolateral fluid to the apical surface, or alteration of cilium beat frequency.