Previous studies have reported that serum levels of the proinflammatory factors IL-1β, IL-6, IL-12, IFN-γ, interferon-inducible protein of 10 kDa (IP-10), and monocyte chemotactic peptide 1 (MCP-1) were closely related to increased lung injury in SARS patients (10). Here, CCL2 is linked to severe acute respiratory syndrome.