CCL2 and viral infectious disease: Viral infection increases levels of IL-1β, IL-6, IL-7, IL-8, IL-10, GM-CSF, granulocyte colony-stimulating factor, interferon-inducible protein 10 (IP10), monocyte chemoattractant protein-1 (MCP-1), macrophage inflammatory protein-1β (MIP-1β) and TNF-α.