You folks just haven't experienced a case of hepatitis "A" ... suggest you read up on it ... the causes, symptoms, and cure, as you're going to the direct source and cause of this viral, liver disease.
I've already had both courses of the vaccine and have eaten fresh fruits and drank the water in Egypt and India and am alive to tell you about it. That should give you some idea about the effectiveness of the vaccine. So get your shot and start rimming!