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Kinetics of the neutralizing antibody (NAb) response in RV135. Serum NAbs for 45 vaccine recipients and 14 placebo recipients were assessed at baseline and at 2 weeks after the third and fourth inoculations (after the first and second protein inoculation) in the TZM-bl assay. All results for placebo recipients were negative (data not shown). Abbreviation: ID50, 50% inhibitory dose.
