来源: TBz 于 2022-01-16 17:48:33
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.
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.