[BFatts]

The title seems misleading to me. Does the fact that "...blood samples from a cohort of more than 2,000 clinical and non-clinical healthcare workers..." might seem to indicate a near-constant exposure to SARS-cov-2? That might increase the chance that the individual is re-exposed and thus his or her immune system has continual "boosts". It seems noteworthy and something worth investigating. Would this apply to the population at large who do not risk continuous exposure?

[CyanLite2]

Potentially, but the major mRNA vaccines are requiring booster shots 4 weeks apart.