That is normal for viral infections as well as vaccinations. Immunity reactions remain in the T cells at that point. And the research doesn't say that it is "running out after 3-8 months", but that antibodies naturally decay, but still exists at 10 months (the time span covered).
The Provincetown Cluster that the CDC used to ring the bell here, is impossible to generalize to the public because it occurred during a gay pride event, where middle age men were congregating intimately and having multiple sex partners. Gay men are vulnerable to a variety of viruses, and a good percentage of them are HIV positive and on anti-viral medication making them immune suppressed. 85% of the Covid cases were from men, and yet only a couple of the over 400 positive cases were hospitalized and no deaths. This is the CDC fear mongering, not about science.
Still no data indicating increased risk from Delta for hospitalizations or deaths, although there are some anecdotal evidence that children are being hospitalized at a greater rate than before. Last week the headlines were that 15% of the cases were children, but since the beginning is has been 14.6% . So nothing really to see there.
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