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Table 1 In vitro activity of BMAP-27, BMAP-28, P19(9/B), and Tobramycin against P. aeruginosa, S. maltophilia and S. aureus CF strains

From: Potential novel therapeutic strategies in cystic fibrosis: antimicrobial and anti-biofilm activity of natural and designed α-helical peptides against Staphylococcus aureus, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia

Bacterial strains (n)

Test agent:

BMAP-27

BMAP-28

P19(9/B)

TOBRAMYCIN

P. aeruginosa (25)

MIC50a

8

16

8

16

MIC90b

16

32

32

>64

MICrange

4-16

4–32

4–32

2- > 64

MBC50c

8

16

16

32

MBC90d

16

32

64

>64

MBCrange

4–16

4–64

4- > 64

2- > 64

MBC/MIC

1.3

1.2

1.9e

1.5f

S. maltophilia (27)

MIC50a

4

4

4

>64

MIC90b

8

4

16

>64

MICrange

4-8

2–8

4–32

4- > 64

MBC50c

8

4

8

>64

MBC90d

16

8

32

>64

MBCrange

4–32

2–16

4–64

8- > 64

MBC/MIC

1.9

1.3

1.7

1.3g

S. aureus (15)

MIC50a

64

8

64

>64

MIC90b

>64

32

>64

>64

MICrange

32- > 64

4–32

32- > 64

4- > 64

MBC50c

>64

8

>64

>64

MBC90d

>64

32

>64

>64

MBCrange

64- > 64

4–32

32- > 64

4- > 64

MBC/MIC

1.2h

1.2

1.2i

1.0l

Total (67)

MIC50a

8

4

8

>64

MIC90b

>64

16

64

>64

MICrange

4->64

2–32

4- > 64

2- > 64

MBC50c

8

8

16

>64

MBC90d

>64

16

>64

>64

MBCrange

4- > 64

2–64

4- > 64

2- > 64

MBC/MIC

1.5m

1.2

1.7n

1.4o

  1. a, bMIC50 and MIC90: MIC (μg/ml) inhibiting 50 and 90% of the strains tested, respectively.
  2. c, d MBC50 and MBC90: MBC (μg/ml) eradicating 50 and 90% of the strains tested, respectively.
  3. Only isolates exhibiting in range MIC values were considered for killing quotient calculation (MBC/MIC): en = 24; fn = 12; gn = 3; hn = 6; in = 2; mn = 58; nn = 57;on = 17.