Table 1.

Comparison of SBA titers and anti-Vi IgG and IgM titers in serum from 18 subjects before (Pre-V) and after (Post-V) vaccination with a Vi PS typhoid vaccine.

Serum no.	SBA titers			Anti-Vi IgG titers			Anti-Vi IgM titers
Pre-V	Post-V	Fold-rise	Pre-V	Post-V	Fold-rise	Pre-V	Post-V	Fold-rise
1	100	400	4	1600	6400	4	800	800	1
2	100	800	8	800	3200	4	100	200	2
3	50	800	16	800	3200	4	100	800	8
4	100	800	8	800	1600	2	400	800	2
5	200	400	2	800	800	1	800	800	1
6	50	1600	32	400	3200	8	1600	3200	2
7	400	3200	8	800	1600	2	800	1600	2
8	200	3200	16	800	3200	4	400	800	2
9	50	200	4	800	3200	4	100	200	2
10	100	400	4	800	1600	2	100	200	2
11	50	400	8	500	19200	38	N.D.	N.D.
12	200	1600	8	800	3200	4	N.D.	N.D.
13	200	1600	8	1200	12800	11	N.D.	N.D.
14	50	400	8	1600	3200	2	N.D.	N.D.
15	800	3200	4	2400	9600	4	N.D.	N.D.
16	100	1600	16	1600	4800	3	N.D.	N.D.
17	800	3200	4	1600	9600	6	N.D.	N.D.
18	800	3200	4	2400	6400	3	N.D.	N.D.
GMT	147	1048	7	1011	3931	4	325	650	2

GMT = geometric mean titer, N.D. = not determined.