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DNA obtained from a human sputum isolate of Mycobacterium tuberculosis, NTI-64719, which showed extensive dissemination in the guinea pig model resulting in a high score for virulence was used to construct an expression library in the lambda ZAP vector. The size of DNA inserts in the library ranged from 1 to 3 kb, and recombinants represented 60% of the total plaques obtained. When probed with pooled serum from chronically infected tuberculosis patients, the library yielded 176 recombinants with a range of signal intensities. Among these, 93 recombinants were classified into 12 groups on the basis of DNA hybridization experiments. The polypeptides synthesized by the recombinants were predominantly LacZ fusion proteins. Serum obtained from patients who were clinically diagnosed to be in the early phase of M. tuberculosis infection was used to probe the 176 recombinants obtained. Interestingly, some recombinants that gave very strong signals in the original screen did not react with early-phase serum; conversely, other whose signals were extremely weak in the original screen gave very intense signals with serum from recently infected patients. This indicates the differential nature of either the expression of these antigens or the immune response elicited by them as a function of disease progression.

infection and immunity

Analysis of a genomic DNA expression library of Mycobacterium tuberculosis using tuberculosis patient sera: evidence for modulation of host immune response