謝謝下麵的網友提供了一張圖，讓我找到了英國政府發布的最新的對疫苗的觀察報告。
原文鏈接：
裏麵數據豐富，值得認真瀏覽。下麵網友的疫苗針對感染的圖，也是出自這個係列的報告。
我找出的重點，主要針對Omicron。
對比Delta，幾種疫苗對現在的Omicron防止有症狀感染的結果：
The symptomatic disease，，，In all periods, effectiveness was lower for Omicron compared to Delta.
1）Among those who had received 2 doses of AstraZeneca, effectiveness dropped from 45 to 50% to almost no effect against Omicron from 20 weeks after the second dose.
2）Among those who had received 2 doses of Pfizer or Moderna effectiveness dropped from around 65 to 70% down to around 10% by 20 weeks after the 2nd dose.
3）2 to 4 weeks after a booster dose vaccine effectiveness ranged from around 65 to 75%, dropping to 55 to 65% at 5 to 9 weeks and 45 to 50% from 10+ weeks after the booster.
疫苗對防止Omicron引起的住院的結果：
Results for hospitalisations，，，
1）One dose of vaccine was associated with a 43% reduced risk of hospitalisation among symptomatic cases with the Omicron variant,
2）2 doses with a 55% reduction up to 24 weeks after the 2nd dose and a 40% reduced risk 25 or more weeks after the 2nd dose, and
3）a 3rd dose was associated with a 74% reduced risk of hospitalisation in the first 2-4 weeks after vaccination dropping slightly to a 66% reduction by 10+ weeks after the booster dose.
