Vaccines extremely effective against COVID variants of concern: Canadian study
Whether it's Pfizer, Moderna or Astra Zeneca, the vaccines used in Canada 'are doing exactly what they should be doing,' including against the Delta variant
www.macleans.ca
加拿大对42万人的分析结论：加拿大打的3种疫苗 Pfizer, Moderna and AstraZeneca ，
对4大新冠变种 Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), and Delta (B.1.617.2). ,
的防护极为有效。
报告称2针PFIZER 对Delta变种的有效率高达87%
| PFIZER | MODERNA | ASTRAZENECA |
| Symptomatic infection | ||
| vs. Alpha: 1st dose: 66% effective 2nd dose: 89% | vs. Alpha 1st dose: 83% effective 2nd dose: 92% | vs. Alpha 1st dose: 64% effective 2nd dose: n/a |
| vs. Beta/Gamma: 1st dose: 60% effective 2nd dose: 84% | vs. Beta/Gamma: 1st dose: 77% 2nd dose: n/a | vs. Beta/Gamma: 1st dose: 48% 2nd dose: n/a |
| vs. Delta: 1st dose: 56% effective 2nd dose: 87% | vs. Delta: 1st dose: 72% 2nd dose: n/a | vs. Delta: 1st dose: 67% 2nd dose: n/a |
| Hospitalization or death | ||
| vs. Alpha: 1st dose: 80% effective 2nd dose: 95% | vs. Alpha: 1st dose: 79% effective 2nd dose: 94% | vs. Alpha: 1st dose: 85% effective 2nd dose: n/a |
| vs. Beta/Gamma: 1st dose: 77% effective 2nd dose: 95% | vs. Beta/Gamma: 1st dose: 89% effective 2nd dose: n/a | vs. Beta/Gamma: 1st dose: 83% effective 2nd dose: n/a |
| vs. Delta: 1st dose: 78% effective 2nd dose: n/a | vs. Delta: 1st dose: 96% effective 2nd dose: n/a | vs. Delta: 1st dose: 88% effective 2nd dose: n/a |
研究报告全文：