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).