title: Immunological responsiveness to M. leprae and BCG antigens in 98 leprosy patients and their household contacts.
abstract: 1. The cellular immune response to M. leprae and BCG antigens was evaluated in 98 leprosy patients and 143 household contacts lacking clinical manifestation of the disease. 2. The proliferative responses and release of Interferon-gamma by peripheral blood mononuclear cells were assessed and both patients and contacts were classified as low or high responders to M. leprae. 3. The high responder contacts constituted 54.8% of the population analyzed, a three times higher proportion when compared to the controls, indicating the possible existence of active infection among them. 4. The correlation coefficient between the immunological response to M. leprae and BCG was found to be higher within the contact group than in the patients, suggesting that cross-reactivity defense mechanisms against mycobacteria exist even before the onset of clinically detectable disease.
authors.affiliation: Laboratório de Hanseníase, Fundação Oswaldo Cruz, Rio de Janeiro, Brasil.
authors.forename: E N
authors.initials: EN
authors.lastname: Sarno
authors.forename: M
authors.initials: M
authors.lastname: Espinosa
authors.forename: E P
authors.initials: EP
authors.lastname: Sampaio
authors.forename: L M
authors.initials: LM
authors.lastname: Vieira
authors.forename: A A
authors.initials: AA
authors.lastname: Figueiredo
authors.forename: C F
authors.initials: CF
authors.lastname: Miranda
authors.forename: D
authors.initials: D
authors.lastname: Esquenazi
authors.forename: J L
authors.initials: JL
authors.lastname: Salgado
authors.forename: N
authors.initials: N
authors.lastname: Nogueira
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial / Q000276:immunology*; D002648:Child; D005260:Female; D006801:Humans; D007111:Immunity, Cellular; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000096:biosynthesis*; D007918:Leprosy / Q000276:immunology* / Q000635:transmission; D015439:Leprosy, Borderline / Q000276:immunology; D015440:Leprosy, Lepromatous / Q000276:immunology; D015441:Leprosy, Tuberculoid / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009163:Mycobacterium bovis / Q000276:immunology*; D009166:Mycobacterium leprae / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D007371:Interferon-gamma