Volume 29, Number 4—April 2023
Dispatch
Serial Intervals and Incubation Periods of SARS-CoV-2 Omicron and Delta Variants, Singapore
Table
Demographic data for SARS-CoV-2 Omicron and Delta variants case-patients in study of incubation periods and serial intervals, Singapore*
| Characteristic | Incubation period cases |
Serial interval cases |
||||
|---|---|---|---|---|---|---|
| Delta, n = 42 | BA.1, n = 36 | Delta, n = 88 | BA.1, n = 76 | BA.2, n = 38 | ||
| Age group, y | ||||||
| Median (IQR) | 24 (9–34) | 26 (21–38) | 32 (21–41) | 27 (20–42) | 4 (3–33) | |
| 0–21 | 15 (35.7) | 10 (27.7) | 23 (26.1) | 23 (30.3) | 25 (65.8) | |
| 22–39 | 20 (47.6) | 18 (50.0) | 39 (44.3) | 30 (39.5) | 7 (18.4) | |
| 40–59 | 3 (7.1) | 7 (19.4) | 14 (15.9) | 16 (21.1) | 5 (13.2) | |
| >60 |
4 (9.5) |
1 (2.8) |
12 (13.6) |
7 (9.2) |
1 (2.6) |
|
| Sex | ||||||
| M | 33 (78.6) | 23 (63.9) | 56 (63.6) | 43 (56.6) | 16 (42.1) | |
| F |
9 (21.4) |
13 (36.1) |
32 (36.4) |
33 (43.4) |
22 (57.9) |
|
| Ethnicity | ||||||
| Chinese | 26 (61.9) | 21 (58.3) | 51 (58.0) | 35 (46.1) | 21 (55.3) | |
| Malay | 13 (31.0) | 1 (2.8) | 26 (29.5) | 7 (9.2) | 10 (7.9) | |
| Indian | 1 (2.4) | 4 (11.1) | 1 (1.1) | 15 (19.7) | 3 (26.3) | |
| Others |
2 (4.8) |
10 (27.8) |
10 (11.4) |
19 (25.0) |
4 (10.5) |
|
| Vaccination status | ||||||
| Unvaccinated | 38 (90.5) | 1 (2.8) | 76 (86.4) | 12 (15.8) | 25 (65.8) | |
| Partially vaccinated | 1 (2.4) | 0 | 4 (4.5) | 0 | 0 | |
| Fully vaccinated | 3 (7.1) | 27 (75.0) | 8 (9.1) | 45 (59.2) | 6 (15.8) | |
| Boosted |
0 |
8 (22.2) |
0 |
19 (25.0) |
7 (18.4) |
|
| Type of transmission | ||||||
| Household | 0 | 1 (2.8) | 30 (34.1) | 38 (50.0) | 14 (36.8) | |
| Nonhousehold | 42 (100) | 35 (97.2) | 58 (65.9) | 38 (50.0) | 24 (63.2) | |
*Values are no. (%) except as indicated.
Page created: January 18, 2023
Page updated: March 21, 2023
Page reviewed: March 21, 2023
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