Ex vivo cytokine mRNA levels correlate with changing clinical status of ethiopian TB patients and their contacts over time. oleh Liya Wassie, Abebech Demissie, Abraham Aseffa, Markos Abebe, Lawrence Yamuah, Hiwot Tilahun, Beyene Petros, Graham Rook, Alimuddin Zumla, Peter Andersen, T Mark Doherty, VACSEL Study Group