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Table 1 Antibiotic-resistance (%) of various antibiotics against 301 MRSA strains, compared with a sample of Italian isolates from 1980.

From: Hospital-associated methicillin-resistant Staphylococcus aureus (HA-MRSA) in Italy

Antibiotics

MRSA isolated in 1980 (15)

MRSA isolated in 1990–1999 (period A) (160)

MRSA isolated in 2000–2007 (period B) (141)

 

S

R

S

R

S

R

Gentamicin

73.3

26.6

1.9

98.1

22**

88

Erythromycin

86.6

13.3

16.9

83.1

16.3

83.7

Clindamycin

86.6

13.3

15

85

35

75

Tetracycline

73.3

26.6

33.1

67

82.2°

17.8

Ciprofloxacin

80

20

3

97

3.5

96.5

Rifampin

73.3

26.6

33.7

66.3*

79

21

Cotrimoxazole

86.6

13.3

58.1***

42

91.5

8.5

  1. * Rifampin resistance is characteristic of CC8 (ST247 and 239)
  2. ** Including the gentamicin-susceptible clone
  3. *** Cotrimoxazole resistance is a marker of ST 239
  4. ° The tetracycline susceptible Italian clone increased in this period