Pandemics and Open Borders

Does the current pandemic seal the case against open borders?  Though I foresee many readers incredulity, the correct answer is: no way.  Why not?  Key point: Borders are already about 98% closed to immigration.  As Ive explained before:

Let C=total number of immigrants legal and illegal who annually enter the U.S. under existing laws.

Let F=the total number of immigrants who would annually enter the U.S. under open borders.

Under perfectly open borders, C=F.  Under perfectly closed...