Figure 7. Association between Ct values and number of new cases
We analyzed the association between Ct values and new cases by COVID-19 wave. During all four waves, new cases declined with increasing Ct values. The time lags differed across the four waves, with 7 days in the first wave, 4 days in the second wave, 7 days in the third wave, and 3 days in the fourth wave (Figure 7).