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Serum samples collected at week 8 were tested for the HAI antibody response specific to A/Anhui/1/2013 H7 virus like particles (VLPs) and A/Anhui/1/2013 H7N9 virus (A and B, respectively. Individual titer was plotted and the mean value was presented as bars. Dotted line represents the lower detection limit (10 HAI units). *p<0.05, **p<0.01.
