Improved assays for detecting the presence of a specific cell-mediated immune response in an individual are provided, where a sample comprising T cells and other cells of the immune system, usually a blood sample or derivative thereof, is contacted with test antigen(s) of interest in the presence of a pattern recognition receptor (PRR) agonist. The sample is incubated for a period of time sufficient to activate effector T cells; and release of immune effector molecule(s) is then detected. In some embodiments, the PRR is an agonist of a toll-like receptor (TLR) expressed by mature antigen presenting cells, including without limitation agonists TLR3 and TLR7, such as LPS, poly I:C, imiquimod, etc.