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. 2026 Aug 18;17:1919103. doi: 10.3389/fimmu.2026.1919103

Figure 2.

Scatter plot with grey dots showing individual measles antibody levels in log10 mIU per mL over time since last vaccination in months, overlaid by a red fitted decay trajectory, red shaded ninety-five percent confidence interval, and a horizontal blue dashed line marking the protective threshold.

Non-linear kinetic trajectory of vaccine-induced antibody decay via restricted cubic splines (RCS). The solid red line models the smooth continuous kinetics of log-transformed measles GMT over the time interval since the last vaccination, accompanied by its 95% shaded confidence bands (knots enforced at the 5th, 35th, 65th, and 95th percentiles).