| | | You are judging vaccines by a standard that even natural immunity never meets, and once again you misunderstand both immunology and the history of successful public health interventions.
No vaccine in history has ever provided absolute, universal, lifelong immunity in every individual, and biology does not really work that way.
Immune responses vary between people, pathogens evolve, and immunity exists on a spectrum rather than as an on/off switch.
That said, some vaccines have come very close, smallpox, measles, and polio achieved extremely high protection because those viruses mutate slowly and present stable targets to the immune system.
Smallpox vaccination was effective enough to eradicate the disease globally, even though it was never literally 100% for every person.
Absolute or “sterilizing” immunity is not biologically impossible, but it is exceptionally rare and unrealistic to expect across entire populations, especially against rapidly mutating respiratory viruses.
Modern vaccines are designed primarily to prevent severe disease, hospitalization, and death, not to guarantee zero infections forever. |
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