For complete herd immunity we'd need something like 100% that about 80% percent take, which is hard. So, our current goal is to get rid of the bad effects of Co

For complete herd immunity we'd need something like 100% that about 80% percent take, which is hard. So, our current goal is to get rid of the bad effects of Covid by limiting spread and limiting severe symptoms. > But i still do not know what is the definition of "effective vaccine". I'm not aware of a rigorous definition, but effective vaccine is something that helps us significantly to accomplish the goal. All the vaccines provide very good (90%+) protection from severe symptoms and it seems to be good even with the current variants. The protection is not as good against any kind of infection, but it is still very significant (like at least 66% even with some variants). > If you have covid and take the vaccine, will the covid go away? No, you have to take the vaccine before Covid. Usually it takes some time before the vaccine is efficient. Like you have to patch your server before it becomes part of a botnet. > Are you still contagious after having the vaccine You may be, but with significantly lower probability. > can you still get the covid but without the bad effects? This seems likely outcome of being vaccinated - your body will somehow already know what to do and will with the virus faster. > What kind of immunity is given by the vaccine and how long does it last? We'll see how long it lasts. It does not seem to be diminishing, so it should be at least a year or so. From the experience from other vaccines, it will probably last longer, but there is the risk of new strains that evade it.