Abstract
The P32 protein antigen of Mycobacterium bovis BCG, identified as antigen 85A in the BCG reference system, was used to investigate the humoral immune response in human tuberculosis (TB). Immunoglobulin G (IgG), IgA, and IgM directed against P32 were measured by an enzyme-linked immunosorbent assay. Mean IgG and IgA antibody levels differed significantly (P less than 0.001) between active-TB patients (50 untreated and 52 treated) and healthy control subjects (111 unvaccinated tuberculin negative, 38 unvaccinated tuberculin positive, and 72 recently BCG vaccinated). Mean IgG antibody levels, but not mean IgA antibody levels, were higher (P less than 0.05) in patients with positive microscopic examination for acid-fast bacilli than in patients with negative microscopic examination. A positive relation was found between mean levels and the extent of disease. There was no difference in mean IgM antibody levels between patients and controls. By setting the upper normal limit at the 95th percentile of the 221 healthy subjects, the sensitivities were 46% in untreated and 63% in treated patients for IgG and 30 and 50%, respectively, for IgA. Of the untreated patients, 56% were positive for either IgG or IgA antibodies. Among the untreated patients with negative direct smear, 35% were positive for IgG and 24% were positive for IgA. When both immunoglobulin classes were combined, the serological test was positive in 47% of those patients. Neither naturally acquired tuberculin hypersensitivity nor BCG vaccination affected positivity frequencies in healthy subjects. Only active TB seemed to induce significant anti-P32 antibody levels and to be associated with positivity. A serological test with P32 as the antigen might therefore be helpful for the rapid diagnosis of TB.
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