Is the vaccine effective? That is the absolutely the wrong question to ask. The question to ask is how effective is the vaccine? What percentage of people with the vaccine die versus what percentage of people unvaccinated die?Why? If it's effective then it shouldn't matter. You can still get it even from stabbed people and pass it on to other stabbed people. Know what that means? It doesn't work! Know why polio isn't a problem anymore?
Asking the right question is crucial.