Who talked about ostracism? Oh, that was you.
I also don't quite get it how you can mix up "screening for a disease" with "deny it's existence", isn't that the complete opposite?
So who is talking about denying Ebola's existence - or if not that not doing anything about it? Oh, you again.
100 years ago, screening for diseases was normal procedure for immigration in pretty much every country - especially if that disease was contagious.
Yes that was before political correctness.
Today we screen only for those "dangerous" soda bottles and creams that people like you think can be used to hijack a plane.
But AIDS, Ebola, Thyphus? No problem, who cares that thousands or even millions will die of it?