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Table 2 The efficiency of dry heat at different periods in the sterilization of pathogenic contaminated paper

From: Sterilization of paper during crisis

Treatments

Average no. of organisms

Inactivation of tested organism %

Time (min)

Tested organism

Temperature °C

Control

100 °C

150 °C

200 °C

100 °C

150 °C

200 °C

15 min

Gram-positive bacteria

Bacillus cereus

10 × 106

6 × 103

5 × 103

0.0

99.0

99.9

100

Staphylococcus aureus

8 × 107

30 × 104

27 × 104

0.0

99.0

99.6

100

Gram-negative bacteria

Escherichia coli

9 × 106

25 × 104

21 × 104

0.0

97.2

97.7

100

Salmonella typhi

12 × 106

20 × 104

17 × 104

0.0

98.3

98.6

100

Fungi

Candida albicans

8 × 106

23 × 104

19 × 104

0.0

97.1

97.6

100

30 min

Gram-positive bacteria

Bacillus cereus

10 × 106

0.0

0.0

0.0

100

100

100

Staphylococcus aureus

8 × 107

7 × 102

0.0

0.0

99.9

100

100

Gram-negative bacteria

Escherichia coli

9 × 106

5 × 102

0.0

0.0

99.9

100

100

Salmonella typhi

12 × 106

3.5 × 102

0.0

0.0

99.9

100

100

Fungi

Candida albicans

8 × 106

4 × 102

0.0

0.0

99.9

100

100

60 min

Gram-positive bacteria

Bacillus cereus

10 × 106

0.0

0.0

0.0

100

100

100

Staphylococcus aureus

8 × 107

0.0

0.0

0.0

100

100

100

Gram-negative bacteria

Escherichia coli

9 × 106

0.0

0.0

0.0

100

100

100

Salmonella typhi

12 × 106

0.0

0.0

0.0

100

100

100

Fungi

Candida albicans

8 × 106

0.0

0.0

0.0

100

100

100