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Graph showing percentages of reactivity for the recombinant TB antigens against the pulmonary-TB (n = 28) and extrapulmonary-TB (n = 20) serum specimens. The B.6 antigen detected antibodies in 46.4% of the pulmonary-TB compared to only 5% of the extrapulmonary-TB serum specimens. The rest of the TB antigens did not exhibit such significant differentiation of reactivity between the two serum panels.
