An opportunistic approach has been undertaken to assess compounds issuing from the VL-2098 back-up programme (nitroimidazooxazine series) showing activity against T. cruzi in vitro, evaluating the most promising candidates in in vivo models of Chagas disease. Two VL lead back-ups belonging to different sub-series (7-substituted nitroimidazooxazines and PA-824 analogues) are active and have been selected for further assessment against Chagas disease in the new bioluminescence in vivo model at LSHTM.