Fig. 1: Viral load trajectories of symptomatic SARS-CoV-2 Delta patients.

The solid lines are viral load trajectories of the analyzed symptomatic SARS-CoV-2 Delta patients in Singapore, split by age and vaccination status. The day since symptom onset was used as the time scale. Points colored in red are below the limit of detection and are hence plotted at the detection limit value of Ct = 50 (10−1.89 copies/mL). The red dotted line is the infectiousness threshold of Ct = 25 (106.11 copies/mL).