In case of Moderna this is even worse. A total

In case of Moderna this is even worse.

A total of 30k participants, who have received 50/50 vaccine and placebo.

And
90/15,000 got a CV infection out of the control group
5/15,000 got a CV infection out of the vaccine group

Effectiveness is then defined as (1-(/5/90))*100 = 94,5% LOL

If they would have given the injection to every participant (placebo or vaccine) and then put all of them into a large room/hall and sprayed them evenly with and CV aerosol from above and then checked 2 weeks later, how many of the 2 groups would be infected, then I would buy this approach, as

1) the number of infected participants would surely be much higher, which would reduce the statistical error, and
2) it is clear that all participants have gotten in the same into contact with the CV.

Now, I know that this would be an unethical approach, but from a scientists standpoint, I would have accepted that as a viable test setup, but the way they are calculating their effectiveness is nothing but laughable, especially with this low number of statistics.