On the adult need for boosters and all that--
I think this is actually a great demo of how unconsciously vaccines play out.
I'm old enough to remember the days when almost all children had mumps, measles, rubella and chickenpox when they were children. All of these illnesses lead to lifelong immunity in the majority of people (if they survive these devastating illnesses, of course <sarcasm>).
So, when the vaccines were introduced, there was no need to vaccinate adults, who were 95% or more immune already and contributing to herd immunity quite generously.
Three generations later (for measles), whatever adults under the age of 45 have in the way of immunity is a relic of their childhood vaccinations. Many are not immune and they certainly are not contributing to herd immunity.
But the legal and medical and social attitudes haven't adjusted, so adults are given a free ride on vaccinations, but every newborn is under constant threat of the needle, and this threat continues until they reach age 18 or so.
Let's not pretend that this is rational, nor that it is effective public health policy.
Finally, when it comes to
Hep A, the situation is truly bizarre. This is a very mild illness for children and a serious illness for adults. So we vaccinate the children, putting them at risk of vaccine reactions to protect adults. This is insane and also immoral.
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