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  Indian J Med Microbiol
 

Figure 1: Optical density of serum samples after the first booster by ELISA. Here, mean of negative control 0.55, standard deviation 0.112, cutoff value for prechallenge sera 0.77, range after the first booster 0.83–1.47, P = 0.0001

Figure 1: Optical density of serum samples after the first booster by ELISA. Here, mean of negative control 0.55, standard deviation 0.112, cutoff value for prechallenge sera 0.77, range after the first booster 0.83–1.47, <i>P</i> = 0.0001