TABLE 1.

Correlation of opsonophagocytosis activity and bacterial survival rates of Salmonella strains with serum antibody titers against S. Typhi LPS^a

Serum anti-LPS isotype and Salmonella serovar	Opsonophagocytosis P value (r)b	Bacterial survival P value (r)c
IgG
S. Typhi	0.05d (0.52)	0.31 (−0.30)
S. Paratyphi A	0.10 (0.44)	0.90 (−0.04)
S. Paratyphi B	0.03d (0.56)	0.31 (−0.30)
IgA
S. Typhi	0.14 (0.40)	0.40 (0.23)
S. Paratyphi A	0.27 (0.31)	0.19 (0.38)
S. Paratyphi B	<0.01e (0.71)	0.38 (−0.26)

^aLPS, lipopolysaccharide (S. Typhi).

^bPeak fold increase on postvaccination day 10 or 14 compared to that on corresponding day 0 (prevaccination). r, Spearman's rho.

^cLowest fold changes in survival rates on postvaccination day 10 or 14 compared to that on corresponding day 0 (prevaccination).

^dP < 0.05.

^eP < 0.01 (two-tailed Spearman test).