The what-if game: Vaccinations and the alien 'threat'

[Karl]

This is an idea I had. It's a seed thought with no actual foundation. In other words it's completely fictious.

This is a game I play when I'm bored. You create a seed thought based on no-evidence and assume it is absolutely true and follow the thought and it's assumed implications.

I'll start it out:

Assumed facts:
1) Aliens exist
2) They regularly visit earth, and possibly operate here
3) They're perceived to be a threat by the powers-that-be
4) Contact is deemed detrimental

To counter the alien threat, and make a profit, the powers that be regularly introduce diseases in the human population that are mildly detrimental to humans but extremely lethal to extra terrestrials/etc.

The best solution they concluded was to engineer these virus' and vaccinate humanity (flu shot/etc) regularly to deter most aliens from visiting and abducting humans.

Reply to continue the thoughts please. I want to see where this goes.