Table 2 Intra-household correlation of lineages between primary and positive secondary cases.

From: Increased transmissibility of SARS-CoV-2 lineage B.1.1.7 by age and viral load

 

Positive secondary cases

Potential

Attack

Primary cases

 

Other

No

 

secondary

Rate

Lineage

N

B.1.1.7

lineages

Genome

Total

cases

(%)

(95%-CI)

B.1.1.7

808

472

19

165

656

1719

38

(35–41)

Other lineages

4433

18

1750

721

2489

9115

27

(26–28)

No Genome

2852

133

540

315

988

5778

17

(16–18)

Total

8093

623

2309

1201

4133

16,612

25

(24–26)

  1. Notes: There were 8093 primary cases, of which 808 (10%) where infected with B.1.1.7, 4433 (55%) were infected with other lineages, and 2852 (35%) did not have a successfully sequenced genome. The 808 primary cases infected with B.1.1.7 had 656 positive secondary cases. Of these cases, 75% (472 + 19 = 491) were successfully sequenced. Of these, 96% (472) were infected with B.1.1.7 and 4% (19) with other lineages. 95%-Confidence intervals are clustered on the household level.
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