A and B Influenza virus specific activation of the murine FcγRI, FcγRII, FcγRIII and FcγRIV by antibodies in pooled pre-challenge sera (AAV-HA, -cHA, -GFP, WIV n = 18, AAV-NP n = 11 mice per group). MDCKII cells were infected with Cal/7/9 (A) or PR8 (B) before mouse serum and FcγR-expressing reporter cells were added. Influenza specific Fc-FcγR interaction induces the production of IL-2 in the FcγR-expressing reporter cell, which was measured by anti-IL2 ELISA (n = 3, technical duplicates). Mean ± SE. 