Table 1.
Characteristics of VOC-2020–12–01 variant within sporadic and primary case household clusters.
| Single case in household (N = 22,221) | Primary case of household cluster (N = 15,837) | |
|---|---|---|
| Variant | ||
| WT | 20,987 (94.5) | 14,069 (88.8) |
| 202,012_01 | 1234 (5.5) | 1768 (11.2) |
| Ethnicity of index case* | ||
| White | 17,799 (81.8) | 12,058 (77.4) |
| Asian/Asian British | 2138 (9.8) | 2407 (15.5) |
| Black/Black British | 738 (3.4) | 367 (2.4) |
| Mixed | 385 (1.8) | 250 (1.6) |
| Other | 708 (3.3) | 492 (3.2) |
| Public Health England Centre region | ||
| East Midlands | 1578 (7.1) | 528 (6.3) |
| East of England | 2286 (10.3) | 939 (11.2) |
| London | 3678 (16.6) | 1464 (17.5) |
| North East | 1647 (7.4) | 567 (6.8) |
| North West | 4695 (21.2) | 1681 (20.1) |
| South East | 2192 (9.9) | 927 (11.1) |
| South West | 720 (3.2) | 212 (2.5) |
| West Midlands | 2011 (9.1) | 774 (9.3) |
| Yorkshire and Humber | 3392 (15.3) | 1263 (15.1) |
| Time period† | ||
| 01/10 - 14/10 | 4192 (19.0) | 1823 (12.1) |
| 15/10 - 28/10 | 4866 (22.1) | 2788 (18.3) |
| 29/10 - 11/11 | 5775 (25.2) | 4332 (26.5) |
| 12/11 - 25/11 | 4450 (20.2) | 3876 (25.5) |
| 26/11 - 13/12 | 2750 (12.5) | 2375 (15.6) |
| Age of index case (years)⁎⁎ | ||
| <10 | 530 (2.4) | 759 (4.8) |
| 10 to 19 | 2735 (12.3) | 1987 (12.6) |
| 20 to 29 | 4967 (22.4) | 2598 (16.4) |
| 30 to 39 | 4214 (19.0) | 2724 (17.2) |
| 40 to 49 | 3240 (14.6) | 2836 (17.9) |
| 50 to 59 | 3054 (13.8) | 2836 (17.9) |
| 60 to 69 | 1631 (7.3) | 1294 (8.2) |
| 70 to 79 | 918 (4.1) | 547 (3.5) |
| 80+ | 937 (4.2) | 250 (1.6) |
| Sex of index case^ | ||
| Male | 10,258 (46.2) | 7583 (48.0) |
| Female | 11,926 (53.8) | 8204 (52.0) |
Race ethnicity data were missing for 453 (2.0%) and 263 (1.7%) of sporadic and cluster primary case, respectively. Race and ethnicity data were provided by the testing laboratory or obtained from hospital records. Broad race and ethnicity categories are based on Office for National Statistics (ONS) standard categories. Race and ethnicity data were used to obtain an unadjusted estimate, and assess trends.
A further 188 (0.9%) single and 633 (4.0%) index cases were counted on 14/12–15/12 and were not included in multivariable analysis adjusted for 2-week time period.
Age data were unavailable for 3 (0.01%) and 6 (0.04%) for sporadic and cluster primary case, respectively.
Data on sex were unavailable for 37 (0.2%) and 50 (0.3%) for sporadic and cluster primary cases, respectively.