TABLE 3.
The most prevalent seven S. aureus phenotypes
| Phenotype | Sizea | Mucoidyb | Hemolysisc | β-toxind | Pigmentatione | No. of isolatesf | %g | No. of patients | No. of spa types | Nuclease > 100% (% of isolates) | Biofilm > 10% (% of isolates) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 1 | 1 | 2 | 1 | 1 | 868 | 37 | 12 | 27 | 12 | 6 |
| 7 | 1 | 1 | 2 | 2 | 1 | 231 | 10 | 5 | 7 | 48 | 14 |
| 1 | 1 | 1 | 1 | 1 | 1 | 227 | 10 | 11 | 14 | 7 | 1 |
| 6 | 1 | 1 | 2 | 1 | 3 | 136 | 6 | 8 | 11 | 3 | 0 |
| 30 | 2 | 2 | 2 | 1 | 1 | 116 | 5 | 7 | 11 | 70 | 64 |
| 22 | 2 | 1 | 2 | 1 | 1 | 114 | 5 | 9 | 15 | 25 | 25 |
| 15 | 1 | 2 | 2 | 1 | 3 | 105 | 5 | 4 | 6 | 1 | 97 |
a
Size, according to the size of the colonies on Columbia blood agar: 1 = normal; 2 = SCVs.
b
Mucoidy: mucoid growth at least on one of the different agars (Columbia blood agar, Schaedler agar, or Congo red agar): 1 = nonmucoid; 2 = mucoid.
c
Hemolysis: 1 = no hemolysis; 2 = hemolysis (as observed on Columbia blood agar).
d
β-toxin: 1 = no β-toxin; 2 = β-toxin (as observed on Columbia blood agar after heat/cold lysis; 24 h at 37°C, 24 h at 4°C).
e
Pigmentation: 1 = gray, 2 = white, 3 = yellow (as observed on Columbia blood agar).
f
All isolates with these special characteristics.
g
%, percentage of isolates with these special characteristics.