International
Canadian and US scientists looked at data from 134,435 Canadians, and say being triple vaxxed against COVID-19 is 61% effective against symptomatic Omicron infection, and 95% effective against severe disease from Omicron. The researchers say two vaccine doses were 89% effective against symptomatic disease from the Delta variant, increasing to 97% after a third jab, but two doses were just 36% effective against symptomatic Omicron, rising to 61% after a third dose. The effectiveness of triple vaccines in preventing severe disease was 99% for Delta, and 95% for Omicron, the researchers say. Preventing Omicron infection and potential future variants may require tools beyond the currently available vaccines, the scientists conclude.
From:
Estimated Effectiveness of COVID-19 Vaccines Against Omicron or Delta Infection, Outcomes
About The Study: This study estimated the effectiveness of COVID-19 vaccines against symptomatic infections due to the Delta and Omicron variants and severe outcomes (hospitalization or death) associated with these infections among adults in Ontario, Canada.
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