Vaccine immunity is known as artificial immunity, and it wanes over time. Natural immunity, commonly known as herd immunity, lasts for longer and is more effective.

Don’t feat nuance, my friend. Keep digging. Don’t trust what I say. Look into it yourself.

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I was vaccinated for MMR as a child, and as a requirement for academia as an adult, was required to get antibody titers.

My MMR antibodies were still sufficient, after 20 years.

Some vaccines wane, in my case, herpes zoster (chickenpox).

Anecdotal evidence, sure, but I feel you’re painting with a broad brush here.