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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