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Table 1 Antimicrobial susceptibility testing of 72 invasive and colonizing GBS

From: Prevalence, population structure, distribution of serotypes, pilus islands and resistance genes among erythromycin-resistant colonizing and invasive Streptococcus agalactiae isolates recovered from pregnant and non-pregnant women in Isfahan, Iran

  Colonizing n (%) Invasive n (%)
Antibiotic Susceptible Intermediate Resistant Susceptible Intermediate Resistant
Penicillin 36 (100) 36 (100)
Cefepime 36 (100) 36 (100)
Ceftriaxone 36 (100) 36 (100)
Cefotaxime 36 (100) 36 (100)
Vancomycin 36 (100) 36 (100)
Tetracycline 2 (5.5) 34 (94.4) 5 (13.8) 31 (86.1)
Levofloxacin 29 (80.5) 5 (13.8) 2 (5.5) 27 (75%) 4 (11.1) 5 (13.8)
Clindamycin 14 (38.8) 11 (30.5) 11 (30.5) 19 (52.7) 6 (16.6) 11 (30.5)
Erythromycin 10 (27.7) 11 (30.5) 15 (41.6) 17 (47.2) 4 (11.1) 15 (41.6)
iMLSBa 5 (13.8) 4 (11.1)
c MLSB b 9 (25) 9 (25)
M phenotype c 1 (2.7) 2 (5.5)
L phenotype d 2 (5.5) 2 (5.5)
MDR 10 (27.7) 6 (16.6)
Total 36 36
  1. a Inducible Macrolides, Lincosamides, and Streptogramin B (MLSB) phenotype with resistance to erythromycin and blunting of zone of inhibition of clindamycin
  2. b Constitutive MLSB with resistance to clindamycin and erythromycin
  3. c Resistant to erythromycin only but not clindamycin by efflux mechanism
  4. d Resistant to clindamycin only without blunting (without D shape)