As I understand it, once you have the vaccine it should ensure that if you catch Covid you wont suffer (if at all) so badly and therefore wont hopefully need hospital treatment, but, you can still catch it, therefore a chance that you can still spread it and here will lie the problem for people you haven't yet had their vaccine and for the many who refuse to take it for various reasons. I think a lot of people are presuming that once they get their two doses they are good to go and I personally cant see that happening unless all unvaccinated people stay indoors. Personally, I am still unsure about taking it. My worry is what side effects could be, say 10 - 20 years later. I hope people dont take it then regret it later. Theres no way of knowing that just now. Its so confusing and happening so fast but I know it's needed.