Table 13.

Zone diameter interpretative standard for S. aureus.

Antibiotics	Zone diameter interpretive criteria (nearest whole mm)
	Sensitive	Intermediate	Resistant
Cefoxitin (30 µg)	≥22	—	≥21
Gentamicin (10 µg)	≥15	13-14	≤12
Erythromycin (15 µg)	≥23	14–22	≤13
Tetracycline (30 µg)	≥19	15–18	≤14
Ciprofloxacin (5 µg)	≥21	16–20	≤15
Clindamycin (2 µg)	≥21	15–20	≤14
Cotrimoxazole (1.25/22.75 µg)	≥16	11–15	≤10
Linezolid (30 µg)	≥21	—	≤20