Putative antibody threshold of protection in children
The VE of the (a) Reverse cumulative distribution of ln IgG EU levels in children aged 3–4 years, vaccinees (blue curve) and controls (brown curve), and vertical line (red) illustrating the 1.5 (ln 4.5 EU) threshold location. (b) Reverse cumulative distribution of ln IgG EU levels in children aged 2–4 years, vaccinees (blue curve) and controls (brown curve), and vertical line (red) illustrating the 1.5 (ln 4.5 EU) threshold location. VE