Okay. I need to answer that, though can't be as simple as I'm sure you would like me to be.
The problem is that for the original Wuhan strain, when you were immunized, it actually totally decreased transmission as well; it did not completely eliminate transmission, but dropped it substantially. It did not drop transmission as much as it did against delta and it doesn't drop transmission very much against omicron.
Omicron is also much more contagious. It grows really well in your upper respiratory tract. You make copious amounts of this virus. It may not make you that sick, but you can spread it galore, all right?