Table 2.

SARS-CoV-2 delta VOC infection, hospitalization, and mortality in the studied populations.

	Unvaccinated with No Prior Infection (Reference)	Unvaccinated with Prior Infection	1 Dose Vaccinated	Primary Vaccinated	Booster Vaccinated
Population (n)	299,216	16,176	32,818	1,037,069	587,150
Infected (n)	12,843	163	1034	22,757	4296
Incidence rate (%)	4.29	1.01	3.15	2.19	0.73
Relative risk reduction [95% CI] (%) As compared to reference		76.52 [72.6–80.01]	26.59 [21.79–31.17]	48.88 [47.75–49.97]	82.95 [82.35–83.54]
Hospitalized patients (n)	5064	23	339	4993	724
Incidence rate (%)	1.69	0.14	1.03	0.48	0.12
Relative risk reduction [95% CI] (%) As compared to reference		91.6 [87.38–94.68]	38.97 [31.86–45.48]	71.55 [70.41–72.65]	92.71 [92.12–93.27]
Hospitalized patients who died in 28 days (n)	2133	4	130	1488	241
Incidence rate (%)	0.71	0.02	0.40	0.14	0.04
Relative risk reduction [95% CI] (%) As compared to reference		96.53 [91.11–99.06]	44.43 [33.64–53.81]	79.87 [78.48–81.17]	94.24 [93.42–94.98]

CI: Confidence Interval.