[ 17/September/21 Bill 4471 Dr Christina Parks testimony – available on youtube]
While almost all true, it isn’t actually a really useful picture.
Yes, vaccinated can catch the virus, and can spread it, but the probability of hospitalisation or severe illness is greatly reduced. So from a human health perspective the vaccines do actually seem to be reasonably effective. And it is not easy to get access to reliable raw data – so uncertainties at multiple levels.
For all the very real concerns I have about this use of mRNA vaccine technology, I have had two doses of the vaccine. I am far more concerned about the effects of long covid which do seem to be rather severe.
And in anything to do with immune systems and evolution more generally, there is a great deal of uncertainty and variation between individuals. So it is all probabilities, necessarily.