Mucosa-associated lymphoid tissues prevent the penetration of many microorganisms into the body.10, 11, 12 Cytokines produced in lymphoid follicles cause plasmacytic differentiation and antibody production (mostly IgA in the respiratory tract), a component of mucosal cell secretions, including that of the vestibular folds.5, 13 Cell-mediated and humoral immunity are unable to control infection in HIV-positive subjects, resulting in loss of several lymphocyte functions and increased susceptibility to secondary and opportunistic infection. This evidence concerns the gene CD79A and Opportunistic infection.