Figure 1. COVID-19 diagnostic response during initial SARS-CoV-2 surveillance in the JHHS.
(A) Cumulative number of positive tests in Washington, DC, and the state of Maryland (white bars) and within the JHHS (black bars). (B) SARS-CoV-2 RT-PCR CT value (S-gene) versus days from patient symptom onset. Data fit with LOESS curve (white regression line). Two outliers (days from onset = 5 weeks, CT value = 30 and days from onset = 28 days, CT value = 31) are not shown. (C) Age distribution of SARS-CoV-2 patients within the JHHS. JHHS, Johns Hopkins Health System; CT, threshold cycle.