The present brief report describes four cases with mycobacterial infection and negative T-SPOT.TB tests. This test proved to be a useful tool to help rule out the diagnosis of active Mycobacterium tuberculosis infection and could therefore prevent unnecessary or inappropriate therapy.

Mycobacterium abscessus is an emerging clinical pathogen commonly associated with non-tuberculous mycobacterial infections. We report herein the draft genome of M. abscessus strain M156.