IL6 and infection: The differences between influenza H5N1 and H1N1 viruses achieved statistical significance with IFN β following apical (p < 0.05) and basolateral (p < 0.01) infection (Figure 7A), IL-6 following apical infection (p < 0.01) (Figure 7B), and IP-10 following basolateral infection (p < 0.05) (Figure 7D).