Figure 3.

Time pattern for the secondary attack rate among children and adult contacts in household SARS-CoV-2 transmission during the study period and stratified by different VOC, January 2020–January 2022

SARS-CoV-2: severe acute respiratory syndrome coronavirus 2; VOC: variants of concern.

Each time point is based on the midpoint of the study period in each study. Multi-VOC points represent studies with two or more predominant variants. Lines in panel A: smoothed curves of secondary attack rates by month for each group; shaded bands: 95% confidence intervals.