TABLE 1.
MALDI-TOF MS identification results for 87 isolates
| Organism(s) (no. of isolates tested)a | No. of isolates with: |
No. of reference spectrab | ||
|---|---|---|---|---|
| Species ID (≥1.9) | Genus-only ID (≥1.7) | No ID (<1.7) | ||
| Nocardia abscessus (1)c | 1 | 3 | ||
| Nocardia abscessus complex (4)d | 3 | 1 | NAg | |
| Nocardia africana (1)c | 1 | 1 | ||
| Nocardia aobensis (2) | 2 | 1 | ||
| Nocardia araoensis (2) | 2 | 2 | ||
| Nocardia asiatica (3)c,e | 3 | 2 | ||
| Nocardia asteroides (2) | 2 | 4 | ||
| Nocardia beijingensis (4) | 3 | 1 | 1 | |
| Nocardia brasiliensis (3)c | 2 | 1 | 2 | |
| Nocardia brevicatena (2) | 2 | 1 | ||
| Nocardia carnea (2)c | 1 | 1 | 1 | |
| Nocardia cyriacigeorgica (13) | 10 | 3 | 16 | |
| Nocardia farcinica (7) | 7 | 12 | ||
| Nocardia higoensis (2)e | 2 | 1 | ||
| Nocardia ignorata (1) | 1 | 1 | ||
| Nocardia niigatensis (1) | 1 | 1 | ||
| Nocardia nova (9)c | 8 | 1 | 2 | |
| Nocardia otitidiscaviarum (3)c | 3 | 6 | ||
| Nocardia paucivorans (6) | 6 | 2 | ||
| Nocardia pseudobrasiliensis (4) | 4 | 1 | ||
| Nocardia puris (4) | 4 | 1 | ||
| Nocardia testacea (1) | 1 | 1 | ||
| Nocardia transvalensis complex (6)f | 5 | 1 | NAg | |
| Nocardia veterana (1)c | 1 | 1 | ||
| Nocardia vinacea (1) | 1 | 1 | ||
| Nocardia wallacei (2)e | 2 | 1 | ||
| All 87 isolates (%) | 72 (83) | 10 (11) | 5 (6) | |
a
Identification based on sequencing of the first ∼500 bp of the 16S rRNA gene.
b
Number of reference spectra in the Bruker Biotyper database, which contains 5,627 spectra, plus the 13 added during this study.
c
One test isolate of this species was a type strain.
d
N. abscessus, N. asiatica, and N. arthritidis belong to the N. abscessus complex (4).
g
NA, not applicable.