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. 2023 Mar 21;131:19–25. doi: 10.1016/j.ijid.2023.03.029

Figure 4.

Figure 4

Comparison of SARS-CoV-2 RNA copy numbers of pre-Omicron versus Omicron variants in fine and coarse fractions at late phase of illness (≥7 days). Comparison of viral RNA copy numbers in both fine and coarse fractions of aerosol samples from (a) breathing, (b) talking, and (c) singing activities. The day of illness denotes the number of days that elapsed since positive diagnosis of SARS-CoV-2 infection. All non-Omicron variants were consolidated as the pre-Omicron group for comparison with the Omicron group. All plots are shown as median values of SARS-CoV-2 RNA copy numbers. Statistical significance was calculated using Kruskal-Wallis test with Dunn correction for multiple comparison. A P-value of P <0.05 is considered statistically significant.