TMPRSS2 and infection: For viral culture, our model predicts VeroE6-TMPRSS2 cells have the highest chance of detecting infectious virus (per totRNA quantity), which is concordant with the importance of TMPRSS2 for SARS-CoV-2 cellular entry [62] and agrees with experiments showing VeroE6-TMPRSS2 cells are more permissive to infection than VeroE6 cells [21,61].