Table 4.

Intra-laboratory variation for potency estimates of study samples in the VaccZyme, Vi poly-l-lysine and biotinylated-Vi ELISAs.

ELISA	Laboratory code	Intra-laboratory variation for study samples as % GCVa
		10/126	G	Hb	I	J	K	L	M
Vi poly-l-lysine	1	5	6	6	9	7	9	6	9
	2	18	15	12	6	20	22	16	23
	3	6	10	ntc	12	8	ncd	8	7
	4	22	27	9	12	ncd	42	44	ncd
	5	12	27	10	11	16	ncd	28	10
	6	9	8	11	21	9	15	25	2
	7	12	25	22	51	29	ncd	47	22
	8	5	10	12	3	6	5	8	6
	9	17	12	12	10	14	10	13	13
	10	7	8	10	16	11	ncd	17	2
VaccZyme	1	10	9	8	10	8	7	8	6
	5	18	14	2	5	25	59	41	32
	6	5	6	3	5	2	2	5	5
Biotinylated-Vi	6	5	5	2	7	8	2	4	4

^aGeometric Coefficient of Variation.

^bCoded duplicate of IS 16/138.

^cNot tested.

^dNot calculated as fewer than 3 valid potency estimates were obtained for the sample.