Figure 4From: Induction of IL-6 and CCL5 (RANTES) in human respiratory epithelial (A549) cells by clinical isolates of respiratory syncytial virus is strain specificPlaque assay replication curves of NH1067 and NH1125. A549 cells were infected with a moi of 0.2. At specific times after infection, cells were harvested and viral titer was determined by plaque assay.Back to article page