An inter-laboratory validation of a real time PCR assay to measure host excretion of bacterial pathogens, particularly of Mycobacterium bovis. oleh Emma R Travis, William H Gaze, Alessandra Pontiroli, Francis P Sweeney, David Porter, Sam Mason, Matthew J C Keeling, Rebecca M Jones, Jason Sawyer, Alicia Aranaz, Elena Castellanos Rizaldos, Jennifer Cork, Richard J Delahay, Gavin J Wilson, R Glyn Hewinson, Orin Courtenay, Elizabeth M H Wellington