It has been shown in a ferret model using microarray analysis that infection with 2009‐H1N1 A/California/07 induced the expression of multiple chemokines including CCL2/MCP‐1, CCL8/MCP‐2, CCL13/MCP‐4, CCL19/ELC, CXCL7/NAP‐2, and CXCL10/IP‐10 37. Here, PPBP is linked to infection.