COVID-19 vaccine durability

The data continue to show (1) levels of antibodies gradually fall over time and (2) the vaccines continue to provide a high degree of protection from hospitalization and death.

Declining circulating antibodies isn't surprising or new, although the rate of decline may be faster than for some other vaccines. Of course, what matters is protection from disease. Interpreting the data on this is complicated by human behavior:
"The waning protection may involve behavior, they noted. "Vaccinated persons presumably have a higher rate of social contact than unvaccinated persons and may also have lower adherence to safety measures," they wrote. "This behavior could reduce real-world effectiveness of the vaccine as compared with its biologic effectiveness, possibly explaining the waning of protection."" https://www.cnn.com/2021/10/06/health/pfizer-vaccine-waning-immunity/index.html

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