meriad wrote:BUT... my concern is that(as far as I understood it) the vaccination doesn't stop the spread; it just minimises symptoms so people aren't as reliant on hospitalisation if they get it.
True, but it's one of those questions.....
From what I have read from Jonhs Hopkins Uni, ICL, US CDC and our own DHSC the vaccines reduce our risk of serious complications, but we can still catch it and pass it on. However, when / if we do the amount of live virus we can pass on - the viral load - is reduced by 60 - 95%. This allows for the possibility that the transmission rate can be reduced so that fewer people can catch it, especially those who have been vaccinated. Cases of double infection are still relatively rare.
Trials are still taking place but the more positive thinking is that the more people we vaccinate the fewer major complications we get. It could be that the viral load from someone vaccinated is so low as for it not to be able to infect another vaccinated person. We will never get rid of Covid, except by some miracle, so there is now talk of an annual booster along the lines of the flu vaccines.
Two phrases to look out for are "effective immunity", which can prevent serious disease, but can't stop it from entering the body or making more copies of itself. The other is "sterilising immunity", which can reduce infections entirely, and thus prevent asymptomatic cases. We are near(er) to the first and working towards the second.