Table 3.

The efficacy of vaccine

Vaccine	Samples	Country	Any vaccine	One dose	Two doses	Reference
BNT162B2	4,272	UK	30.7% (95% CI, 25.2%–35.7%)	35.6% (95% CI, 22.7%–46.4%)	88.0% (95% CI, 85.3%–90.1%)	[62]
ChAdOx1	4,272	UK	30.7% (95% CI, 25.2%–35.7%)	30.0% (95% CI, 24.3%–35.3%)	67.0% (95% CI, 61.3%–71.8%)	[62]
mRNA- 1273	NA	NA	NA	NA	NA	NA

NA: not available.