An inflammatory response that develops 24 to 72 hours after exposure to an antigen that the immune system recognizes as foreign. This type of immune response involves mainly T cells rather than antibodies (which are made by B cells). Also called delayed-type hypersensitivity response. Found on http://www.cancer.gov/dictionary?expand=D
A cell-mediated immune (see Cell-Mediated Immunity) reaction to foreign antigen applied on the surface or just under the skin. The reaction takes 24 to 48 hours to develop. DTH, which is the process involved in the reaction to poison ivy and poison oak, is often used in tests of immune system function. ... (09 Oct 1997) ... Found on http://www.encyclo.co.uk/local/20973