Reality isn't as pretty as drawings.
You have a problem with reality:
Exhibit A: All people entering the USA are examined by Medical Professionals.
Exhibit B. All people entering the USA enter legally
Exhibit C. Medical Professionals can protect themselves from a virus that is almost impossible to contract.
I think you might have a problem with reading comprehension - I haven't said anything close to what you're claiming.
By "You" I mean what appears to be all those making the ridiculous assumptions I've presented as evidence.
But, You Doc, haven't denied believing any of it.
You haven't denied being a space alien, either. That must mean you are one.
None of the "medical community" that you've quoted have made those claims or assumptions either.
They've pointed out those factors that make it very unlikely, not impossible.