<p><b>Copyright information:</b></p><p>Taken from "Sensitivity and specificity of tritiated thymidine incorporation and ELISPOT assays in identifying antigen specific T cell immune responses"</p><p>http://www.biomedcentral.com/1471-2172/8/21</p><p>BMC Immunology 2007;8():21-21.</p><p>Published online 12 Sep 2007</p><p>PMCID:PMC2034595.</p><p></p> (B) tt specific cellular immunity (n = 12), and (C) CMV specific cellular immunity (n = 12). Samples with antigen specific circulating antibodies were considered to have positive immunity