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Polymerase chain reaction (PCR) amplification of the heat shock protein 65 (hsp65) gene followed by high-resolution melting analysis with LCGreen I (Idaho Technology, Salt Lake City, UT) was used to differentiate the mycobacteria species Mycobacterium chelonae, Mycobacterium abscessus, and Mycobacterium immunogenum in less than 20 minutes. A 105-base-pair amplicon that clustered the different species by predicted melting temperature was found from available GenBank hsp65 sequences. We identified 24 clinical isolates within the M chelonae-abscessus group by proximal 16S ribosomal RNA and hsp65 gene sequencing. Rapid-cycle PCR followed by high-resolution melting analysis clustered these samples into the following groups: M abscessus, 12; M abscessus sequence variant, 2; M chelonae, 7; unexpected M chelonae sequence variant, 1; and M immunogenum, 2. The M chelonae variant had a single base change not found in reported GenBank sequences. Advantages of the method include speed, low risk of amplicon contamination (closed-tube), and no need for separation steps (sequencing, electrophoresis, high-performance liquid chromatography) or real-time monitoring.

Rapid Species Identification Within theMycobacterium chelonae–abscessusGroup by High-Resolution Melting Analysis ofhsp65PCR Products