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. 2019 Oct 7;7(4):139. doi: 10.3390/vaccines7040139

Figure 1.

Figure 1

Seroprotection rates of 0.1 IU/mL and 1.0 IU/mL thresholds including the GMCs of pre- and post-booster immunisation against diphtheria in dependence on the quartile-stratified pre-booster levels (A) and time since the last vaccination (B).