COVID-19 vaccine surveillance report, Week 42

“Results: … In individuals aged greater than 30, the rate of a positive COVID-19 test is higher in vaccinated individuals compared to unvaccinated…

Seropositivity estimates for N antibody will underestimate the proportion of the population previously infected due to… (iii) recent observations from UK Health Security Agency (UKHSA) surveillance data that N antibody levels appear to be lower in individuals who acquire infection following 2 doses of vaccination.”