TABLE 3.

Serum IgG responses to HSP60 homologues, synthesized peptide pH9, and H. pylori whole antigen as measured by ELISA

Antigenb	Optical densitya		P valuec
	H. pylori infected (n = 349)	H. pylori uninfected (n = 200)
H. pylori
HSP60	0.365 ± 0.013	0.223 ± 0.015	<0.0001
pH9	0.278 ± 0.012	0.353 ± 0.021	<0.001
E. coli GroEL	0.405 ± 0.019	0.410 ± 0.025	NSd
Human HSP60	0.039 ± 0.003	0.040 ± 0.003	NS

^aValues are means ± standard errors of the means. n, number of patients. 

^bEach antigen was used at 100 ng/well. 

^cDetermined by Welch's unpaired t test. 

^dNS, not significant.