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FFU/PFU ratio of virus MA/67, SB1A, 67-3-1, or 67-5-1. Statistical significance was analyzed by one-way analysis of variance (GraphPad Prism, version 5.00 for Windows; GraphPad Software, San Diego, CA), followed by Tukey's posttest analysis. The asterisk indicates a significant difference between two groups (P < 0.05).
