Fig. 3

Comparison of observed and projected proportion of SARS-CoV-2 variants by age group in the Republic of Korea. Comparison between the observed and projected proportion of SARS-CoV-2 variants in the Republic of Korea by four age groups: A 0–19, B 20–39, C 30–49, and D those aged 60 and over. Points and error bars represent the observed proportion of each SARS-CoV-2 variant, i.e., Wild-type, Alpha variant, Delta variant, and the other variants (Etc.), and their 95% confidence intervals from non-publicly available reports from the Korea Disease Control and Prevention Agency. Lines and shaded areas are projected results with 95% confidence intervals using the proposed model, given that the transmissibility of all SARS-CoV-2 variants has dropped by 40% due to Level 4 social distancing