Long-Term Results of Immunogenicity of Booster Vaccination against SARS-CoV-2 (Hybrid COV-RAPEL TR Study) in Turkiye: A Double-Blind, Randomized, Controlled, Multicenter Phase 2 Clinical Study.

At the threshold value of ≥1/6, the neutralizing antibody positivity against the Delta variant showed a decreasing trend until Day 84 in both vaccine arms and both sexes; however, the positivity on Day 84 was higher in males in the TURKOVAC arm ( Figure 6 a,b).

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In the 40–49 years age group, anti-spike IgG antibody positivity showed an increasing trend and reached the maximum level on Day 28 in both vaccine arms.

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