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. 2021 Jun 21:dyab108. doi: 10.1093/ije/dyab108

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© The Author(s) 2021; all rights reserved. Published by Oxford University Press on behalf of the International Epidemiological Association

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Left: Reproduction numbers for community transmission (R_c) and intra-household transmission (R_h) for the regions whose R values are shown in Figure 4. The overlaid contour plot shows level sets of the overall reproduction number R = R_h + R_c. Right: Estimated share of transmission attributable to household infections (Rh/R). In both graphs, Rh = 0.3 pre lockdown is assumed. Post-lockdown R_h of an area is calculated by multiplying the pre-lockdown value with a mobility factor M obtained from Google’s estimates of the average time spent in residential areas. R_c, community reproduction number; R_h, intra-household reproduction number; R, reproduction number; M, mobility factor (increase in mobility post lockdown).