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Growth characteristics of H7 and H7N9+4M2e viruses in vitro. (A) Replicative activity of influenza viruses at different temperatures in chicken embryos. (B) End-point titers of H7N9 and H7N9+4M2e viruses on MDCK cells at 33 °C. (C) Kinetics of LAIV viral growth in MDCK cells at 33 °C.
