N participants Total person-time (days) Symptomatic COVID-19 infections Incidence per 10,000 person-days Unadjusted VE (95% CI) Adjusted* VE (95% CI)
Total Cohort 1569
Unvaccinated [ref] 415 57699 8 1
14d-149d from 2nd dose 1467 196338 24 1 32.0 (-53.3; 73.1) 38.6 (-40.3; 73.1)
≥150d from 2nd dose 1069 143107 40 3 -0.8 (-121.8; 54.1) 18.5 (-81.5; 63.4)
DELTA PERIOD (1/07/21-1/12/21)
Total Cohort 1565
Unvaccinated [ref] 293 34298 7 2
14d-149d from 2nd dose 1467 163194 22 1 18.8 (-90.7; 65.5) 25 (-77.5; 68.3)
≥150d from 2nd dose 1072 117861 40 3 -4.3 (-138.7 -54.5) 14.9 (-97.7; 63.4)