Nasal Carriage by Staphylococcus aureus among Healthcare Workers and Students Attending a University Hospital in Southern Brazil: Prevalence, Phenotypic, and Molecular Characteristics
Table 3
Antimicrobial susceptibility of 139 Staphylococcus aureus isolated from nasal swab of healthcare workers and students attending the University Hospital of Londrina in southern Brazil.
Antimicrobial
MSSA n = 99 (%)
MRSA n = 40 (%)
S
I
R
S
I
R
Penicillin
13 (13.1)
—
86 (86.9)
—
—
40 (100.0)
Cefoxitin
99 (100.0)
—
—
25 (62.5)
—
15 (37.5)
Oxacillin
99 (100.0)
—
—
28 (70.0)
—
12 (30.0)
Chloramphenicol
97 (98.0)
—
2 (2.0)
38 (95.0)
1 (2.5)
1 (2.5)
Ciprofloxacin
90 (90.9)
3 (3.0)
6 (6.1)
30 (75.0)
6 (15.0)
4 (10.0)
Clindamycin
47 (47.5)
2 (2.0)
50 (50.5)
8 (30.0)
32 (80.0)
Erythromycin
34 (34.3)
7 (7.1)
58 (58.6)
4 (10.0)
1 (2.5)
35 (87.5)
Gentamicin
91 (91.9)
1 (1.0)
7 (7.1)
33 (82.5)
2 (5.0)
5 (12.5)
Linezolid
99 (100.0)
—
—
39 (97.5)
—
1 (2.5)
Rifampicin
98 (99.0)
—
1 (1.0)
40 (100.0)
—
—
Sulfamethoxazole/Trimethoprim
87 (87.9)
1 (1.0)
11 (11.1)
36 (90.0)
1 (2.5)
3 (7.5)
Tetracycline
93 (93.9)
1 (1.0)
5 (5.1)
36 (90.0)
1 (2.5)
3 (7.5)
Tigecycline
98 (99.0)
—
1 (1.0)
40 (100.0)
—
—
Vancomycin
99 (100.0)
—
40 (100.0)
—
—
Antimicrobial susceptibility was determined by disk diffusion, except oxacillin and vancomycin that were determined by broth microdilution assay [23] and the agar-screen test [25], respectively. Disk diffusion and microdilution results were interpreted as recommended by CLSI [23] except tigecycline that was interpreted according to the EUCAST [24]. —: not detected; S: susceptible; I: intermediate; R: resistant.
