Table 3.

The geometric mean titers of serum IgG and IgA antibodies level against toxin A and B of Clostridium difficile obtained from CDI patients 14 days apart.

	1st Sample GMT (SD)	2nd Sample GMT (SD)	p Value a
Toxin A, IgG	15.8 (1.3)	18.9 (1.3)	0.05
Toxin A, IgA	6.9 (1.4)	7.1 (1.5)	0.8
Toxin B, IgG	17.5 (1.3)	23.8 (1.3)	0.02
Toxin B, IgA	6.1 (1.6)	6.2 (1.6)	0.9

^ap value was obtained by paired t test. CDI: Clostridium difficile infection; GMT: geometric mean titer IgA: Immunoglobulin A; IgG: Immunoglobulin G; SD: standard deviation.