Diagnosis of mycobacteria in the routine diagnostic laboratory

Abstract

Non-tuberculous mycobacteria (NTM) have become increasingly important over the last 20 years. These mycobacteria are classified as ?rapid growers? (growth in 7 days or less) or slow growers (growth of isolated colonies in more than 7 days). The rapidly growing mycobacteria (RGM) are the group of mycobacteria which are being recognised in cultures performed in routine diagnostic microbiology laboratories. The increase in notification rate of RGM is partially due to a heightened alertness for mycobacteria by clinicians and laboratory scientists and technicians. However, diagnostic delays remain relatively common, with mycobacteria being considered only following failed treatment with empiric therapy.