Background characteristics of neonates in hospital with SARS-CoV-2 infection by dominant circulating variant; distribution of background characteristics in all UK live births in 202114
| Distribution in live births in England and Wales 2021 (%) | All variants N (%)* | Wildtype N (%)* | Alpha N (%)* | Delta N (%)* | Omicron N (%)* | |
| Total cases | 344 | 146 | 123 | 57 | 18 | |
| Gestation at birth | ||||||
| <28+0 | 0.5 | 11 (3.3) | 5 (3.6) | 2 (1.6) | 3 (5.6) | 1 (5.6) |
| 28+0–31+6 | 0.8 | 41 (12.3) | 8 (5.7) | 12 (9.8) | 20 (37.0) | 1 (5.6) |
| 32+0–36+6 | 6.3 | 79 (23.7) | 27 (19.3) | 34 (27.9) | 12 (22.2) | 6 (33.3) |
| ≥37 | 92.1 | 203 (60.8) | 100 (71.4) | 74 (60.7) | 19 (35.2) | 10 (55.6) |
| Missing | – | 10 | 6 | 1 | 3 | 0 |
| Sex | ||||||
| Male | 51.2 | 188 (55.0) | 84 (57.9) | 63 (51.2) | 31 (55.4) | 10 (55.6) |
| Female | 48.8 | 154 (45.0) | 61 (42.1) | 60 (48.8) | 25 (44.6) | 8 (44.4) |
| Missing | – | 2 | 1 | 0 | 1 | 0 |
| Ethnicity | ||||||
| White | 70.5 | 230 (70.3) | 89 (61.8) | 80 (71.4) | 46 (86.8) | 15 (83.3) |
| Asian/Asian British | 12.2 | 60 (18.3) | 34 (23.6) | 19 (17.0) | 5 (9.4) | 2 (11.1) |
| Black/African/Caribbean/Black British | 4.8 | 19 (5.8) | 11 (7.6) | 6 (5.4) | 1 (1.9) | 1 (5.6) |
| Mixed/Other | 9.1 | 18 (5.5) | 10 (7.0) | 7 (6.3) | 1 (1.9) | 0 (0) |
| Missing | – | 17 | 2 | 11 | 4 | 0 |
*Percentage of those with complete data; duration of variant-predominant periods were not equal.