 We develop an analytical expression for the effective case reproduction number %DIFDELCMD < {\cal %%% R _c(t) that reveals the role of contact tracing in the mitigation and suppression of the epidemics.
<fluency>  We develop an analytical expression for the effective case reproduction number %DIFDELCMD < {\cal %%% R _c(t) that reveals the role of contact tracing in the mitigation and suppression of the epidemics.
 We develop an analytical expression for the effective case reproduction number %DIFDELCMD < {\cal %%% R _c(t) that reveals the role of contact tracing in the mitigation and suppression of the epidemics.