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. 2020 Nov 3;17(21):8114. doi: 10.3390/ijerph17218114

Table 4.

COVID-19 infection risk in four example environments for five scenarios. Unit: percent per episode. The individual risk is that of a particular person being infected and the group risk refers to that of at least one person in the group.

Environment Scenario A
VR 0.35 hr−1
Scenario B
VR 2 hr−1
Scenario C
Masks, 70% Efficiency
Scenario D
Masks, 95% Efficiency
Scenario E
High-Vol VR 9 hr−1
1.1. Office
individual risk
19 7.3 2.3 0.4 2.0
1.2. Office
group risk
47 20 6.6 1.1 6.0
2.1. Classroom
individual risk (>10 years)
10 3.7 1.1 0.2 1.0
2.2. Classroom
group risk (>10 years)
92 60 24 4.5 22
2.3. Classroom
individual risk (≤10 years)
1.0 0.4 0.1 0 0.1
2.4. Classroom
group risk (≤10 years)
22 8.7 2.7 0.5 2.4
3.1. Choir practice
individual risk
30 12 - - 3.5
3.2. Choir practice
group risk
100 96 - - 57
4.1. Reception
individual risk
4.3 1.6 0.5 0.1 0.4
4.2. Reception
group risk
99 80 38 7.6 35
4.3. Party
individual risk
28 11 3.5 0.6 3.2
4.4. Party
group risk
100 100 97 45 96