Table 2.

COVID-19 event rates and estimated vaccine effectiveness 28 days after vaccination in sub-cohorts compared with the unvaccinated individuals

	COVID-19-related hospital admission			COVID-19-related hospital admission requiring critical or intensive care			COVID-19-related death
	Vaccinated (events/person-years)	Unvaccinated (events/person-years)	Vaccine effectiveness (95% CI)	Vaccinated (events/person-years)	Unvaccinated (events/person-years)	Vaccine effectiveness (95% CI)	Vaccinated (events/person-years)	Unvaccinated (events/person-years)	Vaccine effectiveness (95% CI)
Scheme A plus B	302/43 770	897/43 452	67% (62–71)	63/43 794	256/43 510	75% (69–82)	28/43 802	163/43 527	83% (75–89)
Scheme A	153/20 128	444/19 773	66% (60–72)	19/20 143	110/19 802	83% (73–90)	11/20 145	75/19 807	85% (75–93)
Scheme B	149/23 462	453/23 679	67% (60–73)	44/23 651	146/23 708	70% (59–79)	17/23 657	88/23 720	80% (69–90)
Western Cape*	12/2654	39/2651	68% (48–86)	..	..	..	..	..	..

^*Data on admissions requiring critical or intensive care were not available and too few events occurred to enable analysis of COVID-19-related deaths.