Note: Analysis of 852 samples with valid test results on both the single-test point-of-care (POC) and laboratory real-time polymerase chain reaction (RT-PCR) test (see discussion in the text). Laboratory RT-PCR testing served as the definition of disease in this analysis. Sensitivity is defined as the proportion of true-positive results among all positive results. Specificity is defined as the proportion of true-negative results among all negative results. Positive predictive value is the proportion of true-positive results among all positive test results. Negative predictive value is the proportion of true-negative results among all negative results.