Is there a danger that clinical trials of COVID-19 vaccines will be interfered with by the Extraterrestrial Alliance to show lack of effectiveness, even if the approach can work?

This is a very real possibility. After all, having gone to the trouble of making this bioweapon, it is easy for them to also block effective treatments as well as vaccines from being produced to counter their handiwork. It is a sad reality that you cannot count on medical science to answer important questions or even do the best and most rewarding research to work on a problem. Should there be a very effective strategy emerging from human laboratory research, the Extraterrestrial Alliance will have every reason to interfere with its development which they can do in many ways to delay things, to introduce seeming complications, or side effect responses, and they can also alter the data and the responses of those under trial to shift the percentages in a way that makes the vaccine look marginally or totally ineffective and prevent its use totally.