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Table 1 Calculated D values (time taken to achieve a 90% reduction in titre) and half-life (time taken to achieve a 50% reduction in titre—in parentheses) for all surfaces at 20 °C, 30 °C and 40 °C

From: The effect of temperature on persistence of SARS-CoV-2 on common surfaces

  D values (half-life) Z value
20 °C—days 30 °C—days 40 °C – hours (°C)
Stainless steel 5.96 (1.80) 1.74 (12.6 h) 4.86 (1.5 h) 13.62
Polymer note 6.85 (2.06) 2.04 (14.7 h) 4.78 (1.4 h) 13.02
Paper note 9.13 (2.74) 4.32 (32.7 h) 5.39 (1.6 h) 12.43
Glass 6.32 (1.90) 1.45 (10.5 h) 6.55 (2.0 h) 14.65
Cotton 5.57 (1.68) 1.65 (11.0 h) 18.91
Vinyl 6.34 (1.91) 1.40 (10.1 h) 9.90 (3.0 h) 16.86
  1. Calculated Z values (temperature shift required to alter D value by 1 log). No infectious virus was recovered for cotton cloth at 40 °C at 24 h, D values were not able to be calculated
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