Table 2. Internal transcribed spacer fragment sizes determined by capillary gel electrophoresis for clinical isolates, including common fragments and unique lengths that characterise a species.
| Species | No. of isolates | No. of CGE patterns | Single peak (%) | Common fragment sizes in bp (frequency) | Signature (unique) fragment lengths in bp |
| M. chelonae | 40 | 1 | 100 | 384(14)/385(26) | 384/385 |
| M. abscessus | 31 | 2 | 100 | 388.0(29)a | 388.0/393 |
| M. massiliense | 17 | 1 | 100 | 388.5(11)a/389.0(6) | 388.5/389 |
| M. fortuitum | 64 | 27 | 17 | 429(22)/462(7)/475(36) | 415/420/421/430/431/434/435/438/439/455/456/457/458/460/462/463/473/475/479/489/491/529/532/534 |
| M. mucogenicum | 13 | 6 | 92 | 522(8) | 332/372/516/518/521/522 |
| M. flavescens | 5 | 2 | 80 | 468(4) | 468/477/506 |
| M. elephantis | 3 | 3 | 33 | 429(2) | 463/480/498 |
| M. immunogenum | 1 | 1 | 100 | 400 | 400 |
| M. moriokaense | 1 | 1 | 100 | 478b | |
| M. neoaurum | 1 | 1 | 0 | 490/505 | 505 |
| M. phlei | 1 | 1 | 100 | 461 | 461 |
| M. septicum | 1 | 1 | 0 | 467/493 | 467/493 |
a
Rounding to 0.5 base pairs allowed for reliable separation of M. abscessus and M. massiliense.
b
M. moriokaense could not be separated from two isolates of M. fortuitum with indistinguishable electropherograms displaying single peaks at 478 bp.