. 2021 Dec 25;19(1):220. doi: 10.3390/ijerph19010220

Table A4.

Small outbreaks investigated by the Robert Koch Institute or local health authorities.

	Club Meeting	School Berlin 1	School Berlin 2	Meeting Germany	School Hamburg 1	School Hamburg 2	School Hamburg 3	School Hamburg 4
Source/s	[86]	[86]	[86]	[86]	[87]	[87]	[87]	[87]
Air change rate in 1/h	0.20	8.3	10	1.2	1.9	3.3	3.2	3.2
Air change rate in 1/h	0 ± 50%	0 ± 50%	0 ± 50%	0 ± 50%	0 ± 50%	0 ± 50%	0 ± 50%	0 ± 50%
Room volume in m³	254	180	150	170	154	157	157	157
Room volume in m³	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%
Number of previously infected persons	1	1	1	1	1	1	1	1
Number of previously infected persons	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%
Number of susceptible persons	25	27	20	11	28	24	24	27
Main activity	Speaking	Speaking	Speaking	Speaking	Speaking	Speaking	Speaking	Speaking
Breathing volume flow (Q_b,e and Q_b,in) in m³/h	0.54	0.45	0.45	0.54	0.54/0.45 *	0.54/0.45 *	0.54/0.45 *	0.54/0.45 *
Breathing volume flow (Q_b,e and Q_b,in) in m³/h	+ ±20%	+ ±20%	+ ±20%	+ ±20%	+ ±20%	+ ±20%	+ ±20%	+ ±20%
Mask efficiency in %	1	1	1	1	1	1	0.7	0.7
Mask efficiency in %	-	-	-	-	-	-	+ ±20%	+ ±20%
Time of stay in h	1.5	4.5	1.5	2	3	1.5	1.5	0.75
Time of stay in h	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%
Attack rate in %	58	10	6	17	57	33	13	4
Attack rate in %	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%	++ ±5%

Grey background color—Evaluation of the security of the boundary conditions ++ quite secure, + somewhat insecure, 0 unknown/insecure, assumed level of deviation. * Exhalation/inhalation breathing volume flow.