For example, the necessity of chickenpox vaccines is not quite clear-cut because an infection in childhood - that is usually mild - confers greater immunity benefits than a vaccine. See also flu shots.
Chicken pox vaccination seems to offer small but clear advantages. I wasn't thinking about flu shots earlier, but agree that they are of little value; they don't seem like "real" vaccines to my brain because they're relatively temporary.
I loathe the anti-vaccination movement and am probably over-sensitive on this issue.
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