Table 2. Distribution of environmental specimens among COVID-19 cases.
| Characteristic | Total | Environmental specimens in 9 positive COVID-19 cases, n/N (%) ‡ | |
|---|---|---|---|
| Positive environmental specimens, n/N (%) § | Positive COVID-19 cases, n/N (%) | ||
| Total | 20/641 (3.1) | 9/39 (23.1) | 20/136 (14.7) |
| Sampling site | |||
| Home | 13/259 (5.0) | 6/20 (30.0) | 13/68 (19.1) |
| Hotel | 6/113 (5.3) | 3/8 (37.5) | 6/50 (12.0) |
| Restaurant | 0/30 (0.0) | 0/3 (0.0) | 0/0 (0.0) |
| Public area * | 0/108 (0.0) | 0/13 (0.0) | 0/13 (0.0) |
| Marketplace | 0/122 (0.0) | 0/6 (0.0) | 0/0 (0.0) |
| Car | 1/5 (20.0) | 1/1 (100.0) | 1/5 (20.0) |
| Pet | 0/4 (0.0) | 0/1 (0.0) | 0/0 (0.0) |
| Days from symptom onset to sampling † | |||
| 0–3 | 9/110 (8.2) | 4/7 (57.1) | 9/67 (13.4) |
| 4–9 | 6/130 (4.6) | 4/11 (36.4) | 6/37 (16.2) |
| ≥10 | 0/300 (0.0) | 0/16 (0.0) | 0/0 (0.0) |
| Days from diagnosis to sampling | |||
| 0–3 | 20/338 (5.9) | 9/25 (36.0) | 20/136 (14.7) |
| 4–9 | 0/94 (0.0) | 0/5 (0.0) | 0/0 (0.0) |
| ≥10 | 0/209 (0.0) | 0/12 (0.0) | 0/0 (0.0) |
| Severity | |||
| Asymptomatic | 5/101 (5.0) | 3/9 (33.3) | 5/32 (15.6) |
| Mild | 5/220 (2.3) | 3/10 (30.0) | 5/53 (9.4) |
| Moderate | 10/374 (2.7) | 3/20 (15.0) | 10/51 (19.6) |
| Severe | 0/24 (0.0) | 0/1 (0.0) | 0/0 (0.0) |
| Imported | |||
| No | 9/423 (2.1) | 5/28 (17.9) | 9/52 (17.3) |
| Yes | 11/218 (5.1) | 4/11 (36.4) | 11/84 (13.1) |
| Symptoms at onset, yes | |||
| Fever | |||
| No | 18/234 (7.7) | 8/16 (50.0) | 18/98 (18.4) |
| Yes | 2/407 (0.5) | 1/23 (4.3) | 2/38 (5.3) |
| Dry cough | |||
| No | 15/240 (6.3) | 7/18 (38.9) | 15/118 (12.7) |
| Yes | 5/401 (1.3) | 2/21 (9.5) | 5/18 (27.8) |
| Expectoration | |||
| No | 16/493 (3.3) | 8/30 (26.6) | 16/123 (13.0) |
| Yes | 4/148 (2.7) | 1/9 (11.1) | 4/13 (30.8) |
| Fatigue | |||
| No | 20/535 (3.7) | 9/33 (27.2) | 20/136 (14.7) |
| Yes | 0/106 (0.0) | 0/6 (0.0) | 0/0 (0.0) |
| Myalgia | |||
| No | 20/591 (3.4) | 20/36 (55.6) | 20/136 (14.7) |
| Yes | 0/50 (0.0) | 0/3 (0.0) | 0/0 (0.0) |
| Diarrhea | |||
| No | 20/597 (3.4) | 9/37 (24.3) | 20/136 (14.7) |
| Yes | 0/44 (0.0) | 0/2 (0.0) | 0/0 (0.0) |
* Public area included elevator, elevator button, stair armrest.
† A total of 9 asymptomatic COVID-19 cases with 101 environmental specimens were excluded.
§ The number of positive environmental specimens divided by the number of total environmental specimens with 39 COVID-19 cases.
‡ The number of positive environmental specimens divided by the number of environmental specimens with 9 positive COVID-19 cases.