ozstamps:yes, in theory thats how it should work. If you get the blood test, you want to have them do a qualitative test which will tell you "how much" antibody is present (not just a positive or negative) and then check with the OZ equivalent of the Centers for Disease Control to see if they have established what antibody levels are considered "protective". Interestingly, our hospital requires all employees to get these shots, but never tests for anitbody response. Although some people develope an immunity by getting mild cases of hepatits (like a bad stomach flu - but they never become jaundice) its more common to get immunity to the common "childhood" diseases that way, at least in the States.
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JerseyJoe