No. The protection against severe illness is much better than the protection against transmission, but the latter is also not zero. You may have seen something

No. The protection against severe illness is much better than the protection against transmission, but the latter is also not zero. You may have seen something posted on HN recently, as I recall it was a Dutch study that compared transmission within families where the initial infectee was or was not vaccinated? And the result was basically a halving.