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  Indian J Med Microbiol
 

Figure 2: Optical density of serum samples after the second booster by ELISA. Here, mean of negative control 0.55, standard deviation 0.112, cutoff value for prechallenge 0.77, range after the second booster 1.90–2.17, P = 0.0011

Figure 2: Optical density of serum samples after the second booster by ELISA. Here, mean of negative control 0.55, standard deviation 0.112, cutoff value for prechallenge 0.77, range after the second booster 1.90–2.17, <i>P</i> = 0.0011