Table 2.

ELISA optical densities with HspX and GlcB recombinant antigens obtained for the different groups investigated.

	HspX		GlcB
	IgG m ± sd	IgM m ± sd	IgG m ± sd	IgM m ± sd
Uninfected	0.231 ± 0.110	1.090 ± 0.504	0.975 ± 0.614	0.947 ± 0.263
Previous LTBI	0.223 ± 0.121	0.957 ± 0.510	0.977 ± 0.595	0.942 ± 0.314
Recent LTBI	0.252 ± 0.167	1.519 ± 0.394*	0.816 ± 0.574	1.053 ± 0.338

LTBI = latent tuberculosis infection; m = mean of optical density; sd = standard deviation

*IgM against HspX specific humoral responses is significantly higher for recent LTBI than for uninfected (P < 0.0001), and LTBI (P < 0.0001) individuals. There was no statistical difference between IgG OD against HspX among the different groups. There was no statistical difference between IgG and IgM OD against GlcB.