Low agreement and frequent invalid controls in two SARS-CoV-2 T-cell assays in people with compromised immune function - Annette Audigé; Alain Amstutz; Macé M. Schuurmans; Patrizia Amico; Dominique L. Braun; Marcel P. Stoeckle; Barbara Hasse; René Hage; Dominik Damm; Michael Tamm; Nicolas J. Mueller; Huldrych F. Günthard; et al. (PLoS ONE, 2025)