Figure 2.

Impact of contact tracing effectiveness and physical distancing on reduction in R (baseline R 2·6)

Reduction in R under different strategies for different proportions of work, school, and other contacts that are successfully traced (A); effect of the maximum limit on the number of daily contacts in other settings and control tracing strategies on R, either when adults are working as normal, or when 50% have no work contacts (B); effect of proportion of population with no work contacts (C); and effect of app-based tracing under different assumptions about app coverage (D). In all panels, other parameters are as presented in table 1. HQ=household quarantine. R=reproduction number. SI=self isolation.