Estimates of the reproduction number and their corresponding confidence intervals were obtained for the greater Lima metropolitan area and the rest of Peru (Table 2 and Figure F in Text S1). Using a mean generation interval of three days and assuming exponentiallydistributed latent and infectious periods, the mean reproduction number was estimated to be 1.7 (95% CI: 1.6-1.7) for the greater Lima metropolitan area and 1.3 (1.3-1.3) for the rest of Peru. An upper bound of the reproduction number is also provided in Table 2 , in the extreme case of a fixed generation interval of 4 days, suggesting that R remained below 2.2 throughout the pandemic in Peru. There was no significant trend in testing rates during the exponential phase of the pandemic from which the growth rate was measured (P.0.45). R estimates varied little when the time period selected to estimate the growth rate increased or decreased by four days (difference of 0.1-0.2 for the R estimates for the greater Lima metropolitan area and less than 0.05 for the R estimate for the rest of Peru).