Table 3.

Species in household water cultures (one culture per site) initially identified as M. intracellulare and then retested by ITS sequencing compared to the number of isolates of M. avium recovered from the same samples

Study no.	No. of isolates identified by nonsequencing methodsa		No. (%) of isolates identified by ITS sequencing				Reference(s)
	M. avium	M. intracellulare	M. avium	MAC X	M. chimaera	M. intracellulare
1	20	4	3	0	1	0	6
2	64	8	0	3	5	0	L. Lande, unpublished data; 17
3	36	21b	0	5	16	0	1
4	18	8	0	0	8	0	R. J. Wallace, Jr., unpublished data
5	3	0	0	0	0	0	2
Total	141	41	3 (7.3)	8 (19.5)	30 (73.2)	0

^aIdentification by either a DNA probe (AccuProbe; Hologic Gen-Probe Inc.) or 16S rRNA gene PCR (9, 10).

^bEighteen additional isolates were not tested.