Personally, I subscribe to the Fake Alien Invasion theory that with the consecutive failures of Mutually Assured Destruction, Global Ice Age, Global Warming, War on Terror, and Pandemania to install global governance, the Prometheans are finally going play their Alien card.
But if that's not the case, this is certainly an amusing theory from the comments at Ron Unz's site:
World elites made a deal with aliens, in return for allowing some of humanity to survive, the rest are being vaccinated with alien DNA. Notice how fast vaccines have developed, untested? That’s because they were ready, to begin with. The new vaccines attach alien genes to human nerve cells; hence the headaches (caused by minor encephalitis, but no one reports it because the headache is supposed to be a ‘side effect’ of the vaccine) and heart inflammation in some cases (heart does contain nerve cells, a little though, hence fewer reports of heartache after the vaccine). What is the end goal? Well my friends, when the alien invasion happens, those who received alien vaccines will not be able to resist them. In fact, they may end up as alien food. Note that the world has already been a settlement, at an increasing rate in the past twenty years for an alien race from a collapsing planet. So the next wave will be the final one and the largest. > 99% of humanity will be used as a workforce and food source (I know it is hard to believe, but it is true; think of how we use cattle). This is the deal our elites made. Vaccines will render you incapable of resisting aliens. Think of how some parasites and viruses remove the fear of a certain predator in their hosts so that they can continue their life cycles. The same thing.
You might be wondering if an alien civilization is this advanced then why wouldn’t they just destroy us and take our planet instead of making a deal with some people. That’s for the same reason why we wouldn’t go on to kill all animals in a newly found land, but instead, conservatively use them for our needs. Humans are useful animals for them. Also, our numbers are huge comparatively. If we were to actually resist, they’d end up losing their valuable comrades as well. If you’ve read this far, what you can do to protect yourself is going as far as possible by 2027. This is mostly a guess, but people who go to live away in the wilderness will fare relatively better like wild animals. If you have already been vaccinated; well, good luck.
I am somewhat dubious of how effective an argument this will be in the eyes of those considering taking the not-vaxx. I mean, "don't get the shot because you'll end up as dinner on an alien plate" does sound more than a little far-fetched, if not entirely crazy.