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Replication kinetics of H7N3 and H7N9 viruses in human respiratory cells. Calu-3 cells were infected with the indicated viruses at an MOI of 0.01. Supernatants were removed at the indicated times p.i., and titers of infectious virus were determined by standard plaque assay. The limit of virus detection was 10 PFU/ml. The mean from duplicate independent cultures per virus plus standard deviation is shown.
