Table 2 Number of isolated microorganisms in ventilator-associated pneumonia episodes

Gram-positive

8

7

1

 Incidence (VAPs/1000 MV days)

1.04

1.7

0.3

 Methicillin-sensitive Staphylococcus aureus

4

3

1

 Methicillin-resistant Staphylococcus aureus

4

4

0

Gram-negative

95

62

33

 Incidence (VAPs/1000 MV days)

12.4

14.8

9.6

 Pseudomonas aeruginosa (Carba-R)

41 (17)

24 (5)

17 (12)

 Klebsiella species (Carba-R)

17 (3)

12 (0)

5 (3)

  K. pneumoniae (Carba-R)

10 (2)

7 (0)

3 (2)

  K. aerogenes (Carba-R)

6 (1)

4 (0)

2 (1)

  K. oxytoca

1

1

0

 Stenotrophomonas maltophilia

8

6

2

 Acinetobacter spp.

8

7

1

 Escherichia coli

6

4

2

 Serratia marcescens

5

3

2

 Proteus spp.

4

0

4

 Enterobacter cloacae

3

3

0

 Others

3

3

0

Total mechanical ventilation time, days

7638 days

4192 days

3446 days

 Total VAP episodes

103

69

34

 Incidence of VAP per 1000 MV days

13.48

16.46

9.86