Table 2.
COVID-19-related characteristics of cases (N=200) and contacts (N=285) for key steps along the notification cascade.
| Characteristics | Casesa | Contactsa | |||||||||
|
|
App nonuser (N=69) | App user (N=130) | Code not uploaded (N=8) | Code uploaded (N=113) | App nonuser (N=88) | App user (N=195) | ENb before MCTc (N=18) | EN after MCT (N=61) | No EN (N=52) | ||
| Household exposure setting, n (%) | 8 (11.6) | 7 (5.4) | 0 | 5 (4.4) | 41 (46.6) | 71 (36.4) | 6 (33.3) | 27 (44.3) | 15 (28.8) | ||
| Nonhousehold exposure setting, n (%) | 27 (39.1) | 51 (39.2) | 3 (37.5) | 46 (40.7) | 45 (51.1) | 117 (60) | 11 (61.1) | 34 (55.7) | 37 (71.2) | ||
|
|
Private settingd | 9 (13) | 22 (16.9) | 2 (25) | 20 (17.7) | 26 (29.5) | 52 (26.7) | 4 (22.2) | 16 (26.2) | 13 (25) | |
|
|
Workplace | 6 (8.6) | 10 (7.7) | 1 (12.5) | 9 (8) | 10 (11.4) | 23 (11.8) | 1 (5.6) | 3 (4.9) | 11 (21.2) | |
|
|
Public spacee | 9 (13) | 18 (13.9) | 0 | 17 (15) | 6 (6.8) | 35 (17.9) | 4 (22.2) | 14 (23) | 10 (19.2) | |
|
|
School/university | 1 (1.5) | 0 | 0 | 0 | 1 (1.1) | 5 (2.6) | 2 (11.1) | 1 (1.6) | 2 (3.9) | |
|
|
Health care facility | 1 (1.5) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
|
|
Other | 1 (1.5) | 1 (0.7) | 0 | 0 | 2 (2.3) | 2 (1) | 0 | 0 | 1 (1.9) | |
|
|
Unknown setting | 34 (49.3) | 71 (54.7) | 4 (50) | 62 (54.9) | 2 (2.3) | 6 (3.1) | 1 (5.6) | 0 | 0 | |
|
|
Missing | 0 | 1 (0.7) | 1 (12.5) | 0 | 0 | 1 (0.5) | 0 | 0 | 0 | |
| Country in which the exposure occurred, n (%) | |||||||||||
|
|
Switzerland | 32 (46.4) | 54 (41.5) | 4 (50) | 46 (40.7) | 86 (97.7) | 182 (93.3) | 17 (94.4) | 60 (98.4) | 51 (98.1) | |
|
|
Abroad | 3 (4.3) | 5 (3.9) | 0 | 5 (4.4) | 0 | 4 (2.1) | 0 | 1 (1.6) | 1 (1.9) | |
|
|
Unknown country | 34 (49.3) | 71 (54.6) | 4 (50) | 62 (54.9) | 2 (2.3) | 7 (3.6) | 1 (5.6) | 0 | 0 | |
|
|
Missing | 0 | 0 | 0 | 0 | 0 | 2 (1) | 0 | 0 | 0 | |
| Relation of participant with SARS-CoV-2 infected individual, n (%) | |||||||||||
|
|
Family/partner | 8 (11.6) | 10 (7.7) | 1 (12.5) | 7 (6.2) | 48 (54.5) | 90 (46.1) | 8 (44.4) | 34 (55.8) | 19 (36.6) | |
|
|
Friend/acquaintance | 14 (20.3) | 22 (16.9) | 1 (12.5) | 19 (16.8) | 20 (22.7) | 59 (30.3) | 6 (33.3) | 17 (27.9) | 18 (34.6) | |
|
|
Coworker | 3 (4.3) | 8 (6.2) | 1 (12.5) | 7 (6.2) | 10 (11.4) | 29 (14.9) | 2 (11.1) | 6 (9.8) | 11 (21.2) | |
|
|
Customer/business partner | 2 (2.9) | 2 (1.5) | 0 | 2 (1.8) | 2 (2.3) | 2 (1) | 0 | 0 | 2 (3.8) | |
|
|
Patient | 1 (1.5) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
|
|
Other | 7 (10.1) | 15 (11.5) | 0 | 15 (13.3) | 6 (6.8) | 7 (3.6) | 1 (5.6) | 3 (4.9) | 2 (3.8) | |
|
|
Case unknown | 34 (49.3) | 71 (54.6) | 4 (50) | 62 (54.8) | 2 (2.3) | 6 (3.1) | 1 (5.6) | 0 | 0 | |
|
|
Missing | 0 | 2 | 1 (12.5) | 1 (0.9) | 0 | 2 (1) | 0 | 1 (1.6) | 0 | |
| COVID-19 related symptoms and self-reported severity,f n (%) | |||||||||||
|
|
Asymptomatic | 9 (13) | 19 (14.6) | 0 | 16 (14.1) | N/Ag | N/A | N/A | N/A | N/A | |
|
|
Mild to moderate | 47 (68.1) | 91 (70) | 6 (75) | 82 (72.6) | N/A | N/A | N/A | N/A | N/A | |
|
|
Severe to very severe | 12 (17.4) | 20 (15.4) | 2 (25) | 15 (13.3) | N/A | N/A | N/A | N/A | N/A | |
|
|
Missing | 1 (1.5) | 0 | 0 | 0 | N/A | N/A | N/A | N/A | N/A | |
| COVID-19 related symptoms and self-reported severity of exposure case, n (%) | |||||||||||
|
|
Asymptomatic | N/A | N/A | N/A | N/A | N/A | N/A | 3 (16.7) | 10 (16.3) | 8 (15.4) | |
|
|
Mild to moderate | N/A | N/A | N/A | N/A | N/A | N/A | 14 (77.8) | 42 (68.9) | 35 (67.3) | |
|
|
Severe to very severe | N/A | N/A | N/A | N/A | N/A | N/A | 1 (5.5) | 9 (14.8) | 9 (17.3) | |
|
|
Missing | N/A | N/A | N/A | N/A | N/A | N/A | 0 | 0 | 0 | |
aMissing information from 1 case on app use, 1 case on code upload, 2 contacts on app use, and 4 contacts on receipt of an EN.
bEN: exposure notification.
cMCT: manual contact tracing.
dSettings such as friends’ apartments, private vehicles, private gatherings, or events.
eSettings such as restaurants, bars, shops, concerts, public transport, or religious gatherings.
fInformation relating to COVID-19 symptom severity was only collected in case questionnaires.
gN/A: not applicable.