I swear, the international ports and airports just need a giant can of Lysol that everyone coming in gets sprayed with. I have to wonder how much of this third-world crap is coming in over unsecured borders, too.
There's REASONS why immigration officials had strict quarantine procedures for incoming ships and especially immigrants once upon a time. If they had some icky illness, they got sent back. And ships were all stopped well out of the harbor for quarantine checks.