Table 1.

Anti-YF antibody concentrations (UI/mL).

	Mean (95% CI)	Percentage with undetectable antibody (% 95% CI)	Percentage with antibody below protective threshold (% 95% CI)
Overall (N = 481)	2.9 (2.3–3.5)	22.2 (18.6–26.2)	29.7 (25.7–34.0)
Mali (N =238)	3.4 (2.3–4.4)	25.6 (20.2–31.7)	31.5 (25.7–37.8)
Gambia (N = 243)	2.5 (1.9–3.0)	18.9 (14.2–24.4)	28.0 (22.4–34.1)

95% CI, 95% confidence interval; IQR, interquartile range; YF Ab, YF antibody; N, number of observations; NB, Percentage with concentrations below the protective threshold includes individuals with undetectable concentrations.