Abstract
An enzyme-linked immunosorbent assay was constructed by using as antigens the type-specific immunodominant glycopeptidolipids of selected serotypes of Mycobacterium avium. This assay system was used to determine the prevalence of raised antibody levels to these antigens in groups of controls, human immunodeficiency (HIV)-negative and -positive homosexual men, and HIV-negative patients with active M. avium infections as a possible indicator of potential exposure and/or colonization by M. avium in these individuals. The results indicate that while antibody levels were raised in only 2.4% of control individuals, 33% of HIV-negative homosexual men and 44% of HIV-positive patients exhibited raised levels. Moreover, further examination of the HIV-positive group revealed no correlation between antiglycopeptidolipid antibody activity and helper T cell numbers. These data indicate that exposure to M. avium is prevalent among the homosexual male population, regardless of their HIV status. Moreover, the data are suggestive that the emergence of disseminated M. avium disease in HIV-positive patients may sometimes arise from earlier colonization, rather than as a newly acquired infection during terminal immunodeficiency.
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Selected References
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