With regard to the vaccines, I heard a doctor speaking on the radio last week.
His analogy was building a house. The first vaccination isn't the foundations of the house, or the ground floor. It's the full house. Over a few weeks the plumbing starts working, electrics working (your immune response kicks in). The second vaccination adds that little bit more to plug the gaps, sorts out the 'snagging list' (to keep with the new house build analogy). So the house is finished. So you need to give the first dose time to finish its work then do a top up.
And, as people have said, the point of the vaccination isn't to stop you getting it. It might do that. But it's more likely to make the symptoms bearable. Stop you taking up a hospital bed, allowing you to manage the symptoms at home and come out the other side in one piece.
That means the hospital beds will then be available for those who have to take a chance (or decide to take a chance) because they can't have the vaccination (or choose not to). Which gives them, in turn, a better chance of survival. Which is what lockdown is trying to achieve at the moment - because we don't have any alternatives until the vaccinations have been completed.
After all, if 10 people get Covid and 8 need a bed that's fine if there are 8 beds available. But if there are only 7, the 8th person doesn't stand much hope. If the majority of those 10 people get the vaccination, even if they get Covid they can manage at home and it keeps the hospital bed need down to 3 people, everyone has a better chance of coming home. And our NHS staff get the chance of a better rota, more rest and keeping their health intact.
Finally, the Israeli tests did not say it was only 33% effective. They took 200,000 vaccinated people and 200,000 who were not and compared them. Two weeks in and the Covid infection rate was the same in both groups. BUT after two weeks (when the immune system began to work with the vaccination), there was a DROP of 33% in the new infection rate amongst those having the vaccination. That's a third less likely to become infected just two weeks after the vaccination. Apparently, after that, the infection rate in the vaccinated continued to drop. But there were so few infections the scientist couldn't get an accurate percentage fall. They've considered that as good news.
BUT the issue is that they gave the 2 doses three weeks apart. They have no idea how long it would take our regime to get the same results. That's the issue. We're potentially leaving too long between doses and that's what the scientists are now looking at. It could be that we stop this mass vaccination of every single person and go back to the one group having both doses then move onto the next group.