Table 3.
Results of MALDI-typing with Superspectra of 255 independent test strains. MALDI-types M1-M10 refers to groups of PFGE-types as given in Table 1. Reference typing results for the set of strains is given in Table 2
| MALDI-type | Total number of strains | Correct IDa | Mixb | No IDc | Wrong IDd | ||||
|---|---|---|---|---|---|---|---|---|---|
| Number, n | Percent, % | Number, n | Percent, % | Number, n | Percent, % | Number, n | Percent, % | ||
| M1 | 15 | 12 | 80,0 | 0 | 0 | 2 | 13,3 | 1 | 6,7 |
| M2 | 37 | 24 | 64,9 | 0 | 0 | 11 | 29,7 | 2 | 5,4 |
| M3 | 1 | 0 | 0,0 | 0 | 0 | 1 | 100 | 0 | 0,0 |
| M4 | 19 | 15 | 78,9 | 1 | 5,3 | 2 | 10,5 | 1 | 5,3 |
| M5 | 41 | 19 | 46,3 | 1 | 2,4 | 17 | 41,5 | 4 | 9,8 |
| M6 | 16 | 13 | 81,3 | 0 | 0,0 | 3 | 18,8 | 0 | 0,0 |
| M7 | 41 | 28 | 68,3 | 2 | 4,9 | 11 | 26,8 | 0 | 0,0 |
| M8 | 30 | 20 | 66,7 | 0 | 0,0 | 9 | 30,0 | 1 | 3,3 |
| M9 | 14 | 11 | 78,6 | 0 | 0,0 | 3 | 21,4 | 0 | 0,0 |
| M10 | 24 | 18 | 75,0 | 1 | 4,2 | 4 | 16,7 | 1 | 4,2 |
| Othere | 17 | 12 | 70,6 | 1 | 5,9 | 0 | 0,0 | 4 | 23,5 |
| Total | 255 | 172 | 67,4 | 6 | 2,4 | 63 | 24,7 | 14 | 5,4 |
aCorrect ID; Assignment to expected MALDI-type
bMix; Match to two or more MALDI-types
cNo ID; No assignment above the 65% peak matching threshold
dWrong ID; Assigned to a different MALDI-type than the expected with respect to PFGE-type
eOthers refer to strains with PFGE-types for which no Superspectrum were present in the database