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Table 2 Diameter of the inhibition of respiratory bacterial growth by essential oils and by antibiotics* )

From: Chemical composition of 8 eucalyptus species' essential oils and the evaluation of their antibacterial, antifungal and antiviral activities

Essential oils Tested microorganisms (number of strains)
H. influenzae(11) K. pneumoniae(13) P. aeruginosa(10) S. aureus(17) S. agalactiae(9) S. pneumoniae(19) S. pyogenes(4)
E. maidenii 14.5 ± 5.7bc·) 10.7 ± 1.5ab 7.1 ± 1.5a 22.8 ± 6.8d 13.8 ± 2.2bc 13.0 ± 2.6bc 15.5 ± 4.0c
E. odorata 19.2 ± 9.6b 10.8 ± 1.2a 6.0 ± 0.0a 27.4 ± 10.7c 19.4 ± 5.6b 17.4 ± 4.1b 19.0 ± 0.0b
E. lehamnnii 11.5 ± 3.3bc 6.8 ± 0.7a 6.5 ± 0.8a 14.2 ± 4.8c 11.1 ± 1.4b 9.8 ± 2.4b 11.5 ± 1.7bc
E. leucoxylon 8.1 ± 2.2a 6.6 ± 1.1a 6.0 ± 0.0a 16.4 ± 5.4c 12.9 ± 1.8b 14.4 ± 3.0bc 9.0 ± 0.0a
E. bicostata 13.6 ± 5.0b 7.1 ± 1.4a 6.0 ± 0.0a 15.6 ± 2.8bc 13.8 ± 2.8b 17.0 ± 4.0c 13.0 ± 0.0b
E. astringens 13.0 ± 3.8bc 7.1 ± 1.6a 6.0 ± 0.0a 15.5 ± 5.2c 12.0 ± 3.2b 12.3 ± 12.3bc 12.5 ± 1.7bc
E. cinerea 13.0 ± 6.3b 8.5 ± 2.2a 6.2 ± 0.6a 12.2 ± 2.8b 11.6 ± 1.4b 11.5 ± 2.8b 12.5 ± 1.7b
E. sideroxylon 12.3 ± 8.4b 8.1 ± 1.8a 7.0 ± 1.5a 13.7 ± 3.8b 12.3 ± 1.6b 10.7 ± 2.5ab 12.0 ± 0.0b
Reference antibiotics  
Ampicillin 30.5 ± 6.1c NT NT NT NT NT NT
Benzylpenicillin
(Penicillin G)
NT NT NT 24.5 ± 7.5a NT NT NT
Ceftazidime NT 22.3 ± 7.5a 23.8 ± 5.6a NT NT NT NT
Cehotaxime 20.7 ± 6.0b NT NT NT NT NT NT
Ciprofloxacin NT 32.4 ± 2.9b 34.7 ± 5.0b NT NT NT Nt
Erythromycin 19.9 ± 4.2b NT NT 29.9 ± 5.1ab 29.2 ± 4.2b 26.3 ± 12.0a 29.0 ± 0.0c
Fosfomycin NT 22.1 ± 2.9a NT 34.3 ± 11.1c 27.9 ± 5.9ab 35.6 ± 5.5c 24.5 ± 0.8a
Gentamicin NT 22.9 ± 5.0a NT 29.6 ± 6.2ab NT NT NT
Imipenem NT NT 24.6 ± 6.6a NT NT NT NT
Levofloxacin NT NT NT NT 24.8 ± 2.8a 27.3 ± 3.5ab 25.0 ± 1.5ab
Lincomycin 11.3 ± 1.8a NT NT NT NT NT NT
Oxacillin NT NT NT NT 33.6 ± 4.2c 31.7 ± 11.9abc 30.0 ± 0.0c
Piperacillin NT NT 25.3 ± 7.3a NT NT NT NT
Rifamycin 23.9 ± 4.7b NT NT NT 34.4 ± 4.3c 37.5 ± 8.1c 31.5 ± 0.8d
Tetracyclin 29.2 ± 2.6c NT 24.4 ± 6.1a NT NT NT NT
Vancomycin NT NT Nt 25.3 ± 4.4a 26.3 ± 3.4ab 33.0 ± 3.5bc 26.0 ± 2.0 b
  1. *Values are means (mm. ±SD) of triplicate determination.
  2. ·) Values with different letters differ significantly by Duncan's multiple range test (p < 0.05).
  3. NT = Not tested.