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Table 2 Characteristics of the dishwashers in relation to the mean numbers of different bacterial species isolated

From: The dishwasher rubber seal acts as a reservoir of bacteria in the home environment

Characteristic Specific Mean bacterial species per dishwasher
Water hardness (mmol/L CaCO3) Hard (2.0) 7.8
Moderately hard (1.6) 9.6
Slightly hard (1.0) 9.0
Soft (0.5) 4.5
Type of cleaning None 8.9
Chemical 8.5
Mechanical 11.0
Temperature of washing (°C) 50 10.3
60 9.1
65 8.9
70 2.0
Frequency of use (per week) < 7 9.2
7 7.9
8–14 11.0
Age of dishwasher (years) 0.5–1.0 10.9
1.1–2.0 9.8
2.1–3.0 7.8
3.1–6.0 8.3
6.1–8.0 7.7