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Table 2 ELISA optical densities with HspX and GlcB recombinant antigens obtained for the different groups investigated.

From: Humoral response to HspX and GlcB to previous and recent infection by Mycobacterium tuberculosis

  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
  1. LTBI = latent tuberculosis infection; m = mean of optical density; sd = standard deviation
  2. *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.