Figure 1.

Overview of COvid Risk cALculator (CORAL) workflow. Persons under investigation for coronavirus disease 2019 (COVID-19) (PUIs) are eligible for CORAL if they have ≥1 nucleic acid amplification test (NAAT) with negative results and 1 imaging study performed. On completion of CORAL, PUIs are given a risk score which leads to either a prompt for discontinuation of PUI status with discontinuation of enhanced respiratory isolation (ERI) precautions, or a prompt for repeated nasopharyngeal NAAT, further diagnostics for COVID-19 workup, or infectious diseases (ID) physician review. (a If CORAL cannot be performed, clinicians are instructed to contact the ID physician for review.) See Study Setting and Design for explanation of how CoV-Risk and CoV-Presumed status was assigned. Abbreviations: CT, computed tomography; LRT, lower respiratory tract.