Herein comes one of the greatest lies about vaccination. Vaccination only produces IgG antibodies, however there are 5 types of antibodies that work in fighting off a disease, therefore high or low levels of IgG antibody alone doesn't mean much. People have caught the disease they are immunised against when they have high IgG and haven't caught it when unimmunised and have lower IgG. This also is where the lie of "herd immunity" through vaccination comes in too, because herd immunity has only ever been proven with real virus' and real virus' produce at least 3 of the antibodies, not just one!
The break down:
IgG antibodies are predominantly involved in the secondary immune response, as in, it has to have got past all the other checks and balances before this antibody even comes into play in fighting off a disease.
IgM is a common antibody and is the first formed in response to an infection once it has begun.
IgE is a low concentration antibody involved in allergic reactions and fighting eukaryotic protozoa.
IgA is present in the mouth and intestinal tract, which is the main way for virus' and bacteria enter the body, therefore first line of defence.
IgD is found on the surface of B-lymphocytes and together with monomeric IgM, serves as antigen receptor for the activation of B cell and is very important in slowing or stopping the spread of a pathogen during the initial stages of an illness.
And hence the reason vaccination (at most) can only claim to maybe mean you only get a milder case of whatever disease, not to stop the disease altogether. If you don't get the disease at all, it's because the other antibodies (which aren't effected by vaccination) have done their job first.
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