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Growth curves of SPYF and YF5.2iv viruses in cell culture. Experiments were conducted as described in Materials and Methods, using multiplicities of infection of 0.03 PFU/cell. Samples were obtained in triplicate and titrated on Vero cells, and values indicate mean log PFU/ml ± standard deviation. (A) BHK cells. (B) SW-13 cells. (C) Vero cells. (D) C6/36 cells.
