Fig. 5

Descriptive analysis of the relationship between duration since vaccination and anti-S antibody concentration
≤ 3 M = Median of anti-S less than or equal to three months since vaccinated, 3–6 M = Median of anti-S (3.1–6) months since vaccinated, 6–9 M = Median of anti-S (6.1–9) months since vaccinated, 9–12 M = Median of anti-S (9.1–12) months since vaccinated, > 12 M = Median of anti-S greater than 12 months since vaccinated