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If the vaccine makes your immune response recognise and attack it then I'd be surprised if it doesn't bring transmission down, maybe there's a period where it replicates and is transmissible before your immune response kicks in fully and you can spread it a bit but less virus replicating in your body would likely mean less getting passed on. Obviously, immune or not, you'd still remain a vector for spreading other people's shed virus, like touching a few things in a supermarket and spreading it around and passing it on or similar.
Supposing it doesn’t stop transmission, only prevents people from getting ill, would that mean that people who chose to forgo a vaccine will end up at high risk of contracting covid once everyone else is socialising and mixing again?