OAS1 and COVID-19: Moreover, the expression value (point location) of OAS1 in a 14-gene linear regression model can be used as a diagnostic classifier between COVID-19 and Influenza A/B/RSV, since the expression of OAS1 is on the regression line in the comparison of “COVID-19 vs COVID-19” in heterogeneous samples, but it is an outlier of the regression line and 95% confidence interval in comparison of “COVID-19 vs InfluenzaA/B/RSV.