Table 1.

Characterisation of samples used in this study.

Study code	NIBSC code	Description	Reactivity in the VaccZyme ELISA
16/138	–	Pooled Anti-Vi IgG sera from 16 volunteers	631 U mL−1a
Vi-IgGR1, 2011	–	Purified Anti-Vi IgG from 5 volunteers	1280 U mL−1b
A	10/126	Pooled Anti-Vi IgG sera from 9 volunteers	842 U mL−1c
B	16/150	Post-Typbar TCV vaccination serum	350 U mL−1c
C	16/138	Pooled Anti-Vi IgG sera from 16 volunteers	631 U mL−1a
D	16/144	Post-Vi PS vaccination serum	345 U mL−1c
E	16/146	Post-Vi PS vaccination serum	524 U mL−1c
F	16/140	Pre-Vaccination serum	22 U mL−1c

^aBased on an estimate from 3 runs.

^bBased on an estimate from 4 runs.

^cBased on an estimate from one run.