Cell-mediated immunity after XXXX of the lower respiratory tract.

@entity95 @entity5125 @entity2348 @entity56 @entity1729 @entity2258 @entity328
Lower respiratory tract and systemic cell-mediated immunity have been studied in @entity95 after infection with @entity5125 or @entity328 . Respiratory tract cell-mediated immunity was evaluated by direct and indirect assays of migration inhibitory factor (MIF) production. Systemic delayed @entity56 was determined by means of intradermal testing with appropriate antigens. Aerosol exposure to listeria was followed by markedly increased numbers of free lower respiratory tract cells. These cells manifested antigen-stimulated inhibition of migration (mean inhibition of migration = 30.4%). @entity2258 was associated with similar but less dramatic changes. Intravenous administration of organisms was uncommonly followed by inhibition of lower respiratory tract cells in direct migration assays. Fractionated MIF, as well as crude supernates of antigen-stimulated lower respiratory tract and lymph node lymphocytes from animals exposed to listeria aerosols, caused inhibition of normal alveolar macrophage migration. MIF, produced by lymph node lymphocytes, has a molecular weight of approximately 65,000 and is inactivated by chymotrypsin or neuraminidase. Delayed dermal @entity56 to listeria antigen was observed in 54 of 55 animals exposed to listeria aerosols and in all 9 animals infected by the intravenous route. Delayed dermal reactions to pneumococcal sonicate antigen (but not capsular polysaccharide) followed @entity328 @entity1729 in 19 of 28 animals, and was elicited in 5 of 6 animals after intravenous infection. Both local (macrophage migration inhibition) and systemic delayed @entity56 followed @entity2348 of the lower respiratory tract. MIF activity was shown to be one mechanism for inhibition of alveolar macrophage migration.
