Production. A549 cells were infected with RSV at MOI of 1. After 24-hour infection, culture supernatants of RSV-infected and -uninfected cells were collected. The amounts of IL-6, IL-8, and RANTES in the culture supernatants were determined by enzyme-linked immunosorbent assay (ELISA) (DuoSet ELISA development kit, R&D systems, Minneapolis, MN).