Previous studies from this laboratory have suggested a role for cell-mediated immunity in host defense against Legionella pneumophila. In this paper, cell-mediated immunity to L. pneumophila in patients recovered from Legionnaires' disease was studied by examining patient mononuclear cell responses to L. pneumophila antigens. Patient mononuclear cells were assayed both for their capacity to respond to L. pneumophila antigens with the production of cytokines that activate monocytes, as measured by monocyte inhibition of L. pneumophila multiplication, and for their capacity to respond with proliferation, as measured by [3H]thymidine incorporation.
Marcus A. Horwitz
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