> Pfizer and Moderna Vaccines Likely to Produce Lasting Immunity, Study Finds
> The vaccines made by Pfizer-BioNTech and Moderna set off a persistent immune reaction in the body that may protect against the coronavirus for years, scientists reported on Monday.
> Exactly how long the protection from mRNA vaccines will last is hard to predict. In the absence of variants that sidestep immunity, in theory immunity could last a lifetime, experts said. But the virus is clearly evolving.
> “Anything that would actually require a booster would be variant-based, not based on waning of immunity,” Dr. Bhattacharya said. “I just don’t see that happening.”
Pfizer, September 17, 2021 [2]:
> A retrospective cohort study conducted at Kaiser Permanente Southern California suggests that the observed erosion in vaccine effectiveness is likely primarily due to waning effectiveness rather than due to Delta escaping vaccine protection
[1] https://www.nytimes.com/2021/06/28/health/coronavirus-vaccin...