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Table 1 Microbial contamination of different batches of the Dent-O-Sept swab

From: Pseudomonas aeruginosa contamination of mouth swabs during production causing a major outbreak

Production week and year

No of swabs examined

No of swabs contaminated with P. aeruginosa

Other microbes isolated and the number of swabs where they were found

15 2002

12

12

 

11 2002

23

1

3: CNS*, 3: Bacillus sp., 7: GPMF**,

08 2002

12

0

3: CNS*, 1: Micrococci, 1: Diphtheroid rods, 3: GPMF**

07 2002

14

0

5: CNS*, 3: Bacillus sp., 4: Diphtheroid rods, 1: Staph. aureus, 1: Micrococci

06 2002

19

2

1: CNS*, 2: Bacillus sp., 10: GPMF**, 1: enterococcus, 1: Staphylococcus sp.

05 2002

37

2

10: CNS*, 2: Bacillus sp., 4: Micrococci, 8: GPMF**, 2: Mixed flora

04 2002

15

10

 

51 2001

25

5

7: GPMF**, 1: Colony of mobile rods

50 2001

20

1

5: Bacillus sp., 5: Micrococci, 6: GPMF**

48 2001

1

0

 

47 2001

32

16

1: CNS*, 9: Bacillus sp., 3: Gram-negative rods,

45 2001

11

0

2: Bacillus sp., 3: Micrococci

43 2001

16

5

1: Micrococci

42 2001

13

1

1: Bacillus sp., 2: Gram-positive cocci, 7: Mixed flora, 1: Staphylococcus?

41 2001

28

18

1: CNS*, 3: Bacillus sp.

39 2001

15

0

1: CNS*, 2: Bacillus sp., 2: Micrococci, 1: GPMF**, 1: Streptococcus Equisimilis group G., 1: Mould

38 2001

26

3

4: CNS*, 1: Bacillus sp., 1: Micrococci, 1: Yeast

36 2001

21

0

1: Micrococci, 3: GPMF**, 1: Enterocci, 1: Fungus

34 2001

34

0

1: CNS*, 4: Bacillus sp., 1: Micrococci, 2: GPMF**

29 2001

2

0

2: CNS*, 2: Micrococci,

27 2001

16

0

1: Bacillus sp.

24 2001

21

0

1: Bacillus sp., 3: Micrococci, 2: GPMF**

22 2001

11

0

3: CNS*

19 2001

13

0

 

18 2001

17

0

 

17 2001

18

0

4: CNS*, 1: Bacillus sp., 1: GPMF**, 1: α-hemolytic Streptococcus, 1: Acinetobacter sp.

13 2001

14

0

2: CNS*, 2: Bacillus sp.,

12 2001

10

0

1: CNS*, 3: Bacillus sp., 1: Gram-negative rods

11 2001

10

0

 

09 2001

11

0

2: CNS*, 1: Bacillus sp.

07 2001

29

0

5: CNS*, 2: GPMF**

05 2001

21

0

7: CNS*, 3: Bacillus sp., 2: Yeast, 2: Acinetobacter baumanii

04 2001

14

0

2: CNS*, 3: Bacillus sp.

Total 2000

286

0

26: CNS*, 11: Bacillus sp., 3: Staph. aureus, 2: Micrococci, 1: Yeast, 1: Mould, 1: Candida albicans

Total 1999

164

0

11: CNS*, 7: Bacillus, 2: Gram-positive spore forming, 1: Gram-negative rods, 1: Staph. aureus, 1: Yeast, 1: Pseudomonas sp. (not P. aeruginosa)

Total 1998

181

0

6: CNS*, 7: Bacillus sp., 3: Micrococci, 1: GPMF**, 1: Yeast, 2: Mould

Total 1997

139

0

12: CNS*, 2: GPMF**, 7: Bacillus sp., 1: Micrococci, 1: Yeast, 1: Mould

Total 1996

63

0

1: Streptococcus pyogenes

Total 1995

64

0

3: CNS*, 1: Bacillus sp., 1: Micrococci, 2: Enterococci, 11: Staph. aureus, 1: Pseudomonas sp. (not P. aeruginosa)

Total 1994

24

0

 

Total 1993

11

0

 

1992 and older

52

0

1: CNS*, 5: Bacillus sp., 1: Micrococci

  1. * CNS: Coagulase negative staphylococci
  2. ** GPMF: Gram-positive mixed flora
  3. For 5 of the examined swabs the wraps had been opened before arrival to the laboratory.