Strains used for specificity testing.

Non-tuberculous mycobacterial (NTM) strains and other bacterial species used in the determination of the specificity of the IS6110 and IS1081 RPA assays. All tested negative by both RPA assays. Isolates marked * were supplied by the Mycobacteriology Unit, Institute of Tropical Medicine, Antwerp, Belgium. All other isolates were from the Washington State Public Health Laboratory strain collection.