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Cross-reactivity of postvaccination human serum antibodies elicited by the X-187 vaccine against various A/H3N2 viruses analyzed by NT test. GMTs of NT tests to egg-grown (black bars) and MDCK-grown (white bars) viruses are shown. Numbers above the columns indicate percentages compared with the GMTs of vaccine virus. The serum samples used were the same as those described in the legend for Fig. 3. (A) Adult group; (B) middle-aged group; (C) elderly group.
