Inflammatory cytokines, such as IL-6, IL-8, and MCP-1 levels, were higher in human embryonic lung fibroblast cells (MRC-5) infected by rAdV3E-K7 and rAdV3E-K55 than those by rAdV3E both at 10 and 26 h post-infection (data not shown). Here, CCL2 is linked to infection.