Fig. 5 | Signal Transduction and Targeted Therapy

Fig. 5

From: Safety, immunogenicity and protective effect of sequential vaccination with inactivated and recombinant protein COVID-19 vaccine in the elderly: a prospective longitudinal study

Fig. 5The alternative text for this image may have been generated using AI.

Analysis of changes in antibodies before and after infection. Changes in antibody levels were depicted in (a) and (b) for infected participants, and in (c) and (d) for uninfected participants. Data were analyzed using the Mann–Whitney U test. **P < 0.01, ***P < 0.001, ****P < 0.0001. ns no significance. Bold black horizontal lines represented the median values of antibody titers. Dot lines represented the threshold of antibodies

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