Figure 1.

Key time-to-event intervals of SARS-CoV-2 Delta infections in Hunan, China. (A) Estimated incubation period distribution by log-normal distributions and generation time by gamma distributions based on 71 confirmed cases. (B) Estimated distribution of the serial interval by Weibull distributions and of the infectiousness profile by gamma distributions based on 54 transmission pairs. (C) Time intervals from symptom onset to hospitalization, isolation, first time of sampling, and diagnosis of symptomatic cases before and after the implementation of NPIs.

Note: The infectiousness profile describes the infectiousness of an individual over time since the onset of symptoms.

Abbreviation: NPIs=nonpharmaceutical interventions; SARS-CoV-2=severe acute respiratory syndrome coronavirus 2.