|The vaccination-induced measles virus antibodies decline in the absence of natural booster infections. It is important to follow how long the protection achieved by the present vaccine programme will last after elimination of indigenous measles.
I found this interesting, in light of the discussion about life long immunity from measles vaccine. AKA we don't know what we are doing.
To be fair, there may be people who do not what they are doing. Haven't found them yet.