IFNA4 and infection: At 6 h of infection, the IFN repertoire was limited to IFNA1 and IFNB1 but at 16 h it had increased sevenfold in number (IFNA1, IFNA2, IFNA4, IFNA5, IFNA7, IFNA8, IFNA10, IFNA13, IFNA14, IFNA16, IFNA21, IFNB1, and IFNW1) (Table 1).